feat: add file assertion library for bats tests (#2842)

Adds the file assertion library for bats tests,
https://github.com/bats-core/bats-file

Split out from #2835

GitOrigin-RevId: fa2fe77c742a0066e660cdc59ac545207a7fcb62

integration_tests/bats.bzl

@@ -14,6 +14,7 @@ def bats_test(srcs = [], **kwargs):
         "@bats_assert//:dir",
         "@bats_support//:dir",
         "@bats_detik//:dir",
+        "@bats_file//:dir",
     ]
     env = kwargs.pop("env", {})
 
@@ -26,6 +27,7 @@ def bats_test(srcs = [], **kwargs):
         ],
         deps = [
             "@bats_assert//:bats_assert",
+            "@bats_file//:bats_file",
             "@bats_core//:bats_core",
             "@bats_core//:bin",
             "@bats_detik//:bats_detik",

integration_tests/bats_deps.bzl

@@ -5,9 +5,12 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 CORE_VERSION = "1.8.2"
 ASSERT_VERSION = "2.1.0"
 SUPPORT_VERSION = "0.3.0"
+FILES_VERSION = "c0f822aceac6a70614c5a7c92fd9c5ddd97c7f83"  # May 25, 2023
 DETIK_VERSION = "0d71702f9016a955fc8197d562bb1bb88ddf63a8"  # Aug 8, 2022
 
 def bats_dependencies():
+    """Fetches the required dependencies to run bats_test"""
+
     http_archive(
         name = "bats_core",
         sha256 = "0f2df311a536e625a72bff64c838e67c7b5032e6ea9edcdf32758303062b2f3b",
@@ -59,6 +62,33 @@ sh_library(
         """,
     )
 
+    http_archive(
+        name = "bats_file",
+        urls = [
+            "https://github.com/bats-core/bats-file/archive/{}.tar.gz".format(FILES_VERSION),
+        ],
+        sha256 = "76a19ead26c7cf666b9fbe659874b947392443de638f76802f057739f04a8d33",
+        strip_prefix = "bats-file-{}".format(FILES_VERSION),
+        add_prefix = "bats-file",
+        build_file_content = """
+sh_library(
+    name = "bats_file",
+    srcs = glob([
+        "bats-file/src/**",
+        "bats-file/load.bash",
+    ]),
+    visibility = ["//visibility:public"]
+)
+sh_library(
+    name = "dir",
+    srcs = [
+        "bats-file",
+    ],
+    visibility = ["//visibility:public"]
+)
+        """,
+    )
+
     http_archive(
         name = "bats_support",
         urls = [