report: rework the composition to use redacted verbose printouts

This commit changes the composition of Sentry reports to include a
redacted verbose printout of the error at the beginning of the main
Message field.

This ensures that error objects with more complex printouts than just
safe detail strings get spelled out more clearly in the sentry
reports.

One example of this is that the tree structure of errors included
behind barriers (e.g. that included behind
errors.NewAssertionErrorWithWrappedErrf) is preserved in the sentry
printout.

fmttests/testdata/format/opaque

@@ -69,14 +69,19 @@ Error types: (1) *errbase.opaqueLeaf
 =====
 == Message payload
 ×
-×
---
+(1) ×
+  | ×
+  |
+  | (opaque error leaf)
+  | type name: github.com/cockroachdb/errors/fmttests/*fmttests.errNoFmt
+Error types: (1) *errbase.opaqueLeaf
+-- report composition:
 *fmttests.errNoFmt
 == Extra "error types"
 github.com/cockroachdb/errors/fmttests/*fmttests.errNoFmt (*::)
 == Exception 1 (Module: "error domain: <none>")
 Type: "*fmttests.errNoFmt"
-Title: "×\n×"
+Title: "×"
 (NO STACKTRACE)
 
 run
@@ -168,18 +173,27 @@ Error types: (1) *fmttests.werrFmt (2) *errbase.opaqueLeaf
 ===== Sentry reporting
 =====
 == Message payload
-×
 ×: ×
+(1) ××
+×
+×
 ×
---
+×
+Wraps: (2) ×
+  | ×
+  |
+  | (opaque error leaf)
+  | type name: github.com/cockroachdb/errors/fmttests/*fmttests.errNoFmt
+Error types: (1) *fmttests.werrFmt (2) *errbase.opaqueLeaf
+-- report composition:
 *fmttests.errNoFmt
 *fmttests.werrFmt
 == Extra "error types"
 github.com/cockroachdb/errors/fmttests/*fmttests.errNoFmt (*::)
 github.com/cockroachdb/errors/fmttests/*fmttests.werrFmt (*::)
 == Exception 1 (Module: "error domain: <none>")
 Type: "*fmttests.errNoFmt"
-Title: "×\n×: ×\n×"
+Title: "×: ×"
 (NO STACKTRACE)
 
 run
@@ -283,18 +297,27 @@ Error types: (1) *errbase.opaqueWrapper (2) *errbase.opaqueLeaf
 ===== Sentry reporting
 =====
 == Message payload
-×
 ×: ×
-×
---
+(1) ×
+  | ×
+  |
+  | (opaque error wrapper)
+  | type name: github.com/cockroachdb/errors/fmttests/*fmttests.werrNoFmt
+Wraps: (2) ×
+  | ×
+  |
+  | (opaque error leaf)
+  | type name: github.com/cockroachdb/errors/fmttests/*fmttests.errNoFmt
+Error types: (1) *errbase.opaqueWrapper (2) *errbase.opaqueLeaf
+-- report composition:
 *fmttests.errNoFmt
 *fmttests.werrNoFmt
 == Extra "error types"
 github.com/cockroachdb/errors/fmttests/*fmttests.errNoFmt (*::)
 github.com/cockroachdb/errors/fmttests/*fmttests.werrNoFmt (*::)
 == Exception 1 (Module: "error domain: <none>")
 Type: "*fmttests.errNoFmt"
-Title: "×\n×: ×\n×"
+Title: "×: ×"
 (NO STACKTRACE)
 
 run
@@ -417,11 +440,24 @@ Error types: (1) *fmttests.werrFmt (2) *errbase.opaqueWrapper (3) *errbase.opaqu
 ===== Sentry reporting
 =====
 == Message payload
+×: ×: ×
+(1) ××
 ×
-×: ×
-×: ×
 ×
---
+×
+×
+Wraps: (2) ×
+  | ×
+  |
+  | (opaque error wrapper)
+  | type name: github.com/cockroachdb/errors/fmttests/*fmttests.werrNoFmt
+Wraps: (3) ×
+  | ×
+  |
+  | (opaque error leaf)
+  | type name: github.com/cockroachdb/errors/fmttests/*fmttests.errNoFmt
+Error types: (1) *fmttests.werrFmt (2) *errbase.opaqueWrapper (3) *errbase.opaqueLeaf
+-- report composition:
 *fmttests.errNoFmt
 *fmttests.werrNoFmt
 *fmttests.werrFmt
@@ -431,7 +467,7 @@ github.com/cockroachdb/errors/fmttests/*fmttests.werrNoFmt (*::)
 github.com/cockroachdb/errors/fmttests/*fmttests.werrFmt (*::)
 == Exception 1 (Module: "error domain: <none>")
 Type: "*fmttests.errNoFmt"
-Title: "×\n×: ×\n×: ×\n×"
+Title: "×: ×: ×"
 (NO STACKTRACE)
 
 run
@@ -566,11 +602,24 @@ Error types: (1) *errbase.opaqueWrapper (2) *errbase.opaqueWrapper (3) *errbase.
 ===== Sentry reporting
 =====
 == Message payload
-×
-×: ×
-×: ×
-×
---
+×: ×: ×
+(1) ×
+  | ×
+  |
+  | (opaque error wrapper)
+  | type name: github.com/cockroachdb/errors/fmttests/*fmttests.werrNoFmt
+Wraps: (2) ×
+  | ×
+  |
+  | (opaque error wrapper)
+  | type name: github.com/cockroachdb/errors/fmttests/*fmttests.werrNoFmt
+Wraps: (3) ×
+  | ×
+  |
+  | (opaque error leaf)
+  | type name: github.com/cockroachdb/errors/fmttests/*fmttests.errNoFmt
+Error types: (1) *errbase.opaqueWrapper (2) *errbase.opaqueWrapper (3) *errbase.opaqueLeaf
+-- report composition:
 *fmttests.errNoFmt
 *fmttests.werrNoFmt
 *fmttests.werrNoFmt
@@ -580,7 +629,7 @@ github.com/cockroachdb/errors/fmttests/*fmttests.werrNoFmt (*::)
 github.com/cockroachdb/errors/fmttests/*fmttests.werrNoFmt (*::)
 == Exception 1 (Module: "error domain: <none>")
 Type: "*fmttests.errNoFmt"
-Title: "×\n×: ×\n×: ×\n×"
+Title: "×: ×: ×"
 (NO STACKTRACE)
 
 run
@@ -734,12 +783,29 @@ Error types: (1) *fmttests.werrFmt (2) *errbase.opaqueWrapper (3) *errbase.opaqu
 ===== Sentry reporting
 =====
 == Message payload
+×: ×: ×: ×
+(1) ××
+×
 ×
-×: ×
-×: ×
-×: ×
 ×
---
+×
+Wraps: (2) ×
+  | ×
+  |
+  | (opaque error wrapper)
+  | type name: github.com/cockroachdb/errors/fmttests/*fmttests.werrNoFmt
+Wraps: (3) ×
+  | ×
+  |
+  | (opaque error wrapper)
+  | type name: github.com/cockroachdb/errors/fmttests/*fmttests.werrNoFmt
+Wraps: (4) ×
+  | ×
+  |
+  | (opaque error leaf)
+  | type name: github.com/cockroachdb/errors/fmttests/*fmttests.errNoFmt
+Error types: (1) *fmttests.werrFmt (2) *errbase.opaqueWrapper (3) *errbase.opaqueWrapper (4) *errbase.opaqueLeaf
+-- report composition:
 *fmttests.errNoFmt
 *fmttests.werrNoFmt
 *fmttests.werrNoFmt
@@ -751,5 +817,5 @@ github.com/cockroachdb/errors/fmttests/*fmttests.werrNoFmt (*::)
 github.com/cockroachdb/errors/fmttests/*fmttests.werrFmt (*::)
 == Exception 1 (Module: "error domain: <none>")
 Type: "*fmttests.errNoFmt"
-Title: "×\n×: ×\n×: ×\n×: ×\n×"
+Title: "×: ×: ×: ×"
 (NO STACKTRACE)