feat(cli): improve migration runner output

[juice49]

Description

The migration run commands can be run from any Studio project subdirectory, but their output messages currently assume the user is in the project root. This branch makes the output clearer, and adds consistent list formatting when multiple migrations are found.

Before

When no migrations found

sanity migration run nonexistent

Not in project directory, assuming context of project at /Users/ash/projects/sanity/dev/test-studio

Error: No migration found for "nonexistent" in current directory. Make sure that the migration file exists and exports a valid migration as its default export.
 Tried the following files:
 - migrations/nonexistent.mjs
 - migrations/nonexistent.js
 - migrations/nonexistent.ts
 - migrations/nonexistent.cjs
 - migrations/nonexistent/index.mjs
 - migrations/nonexistent/index.js
 - migrations/nonexistent/index.ts
 - migrations/nonexistent/index.cjs

When multiple migrations found

sanity migration run multiple

Not in project directory, assuming context of project at /Users/ash/projects/sanity/dev/test-studio

Error: Found multiple migrations for "multiple" in current directory migrations/multiple.mjs, migrations/multiple.js, migrations/multiple.ts, migrations/multiple.cjs, migrations/multiple/index.mjs, migrations/multiple/index.js, migrations/multiple/index.ts, migrations/multiple/index.cjs

After

When no migrations found

sanity migration run nonexistent

Not in project directory, assuming context of project at /Users/ash/projects/sanity/dev/test-studio

Error: No migration found for "nonexistent" in the /Users/ash/projects/sanity/dev/test-studio/migrations directory. Make sure that the migration file exists and exports a valid migration as its default export.
 Tried the following files:
 - nonexistent.mjs
 - nonexistent.js
 - nonexistent.ts
 - nonexistent.cjs
 - nonexistent/index.mjs
 - nonexistent/index.js
 - nonexistent/index.ts
 - nonexistent/index.cjs

When multiple migrations found

sanity migration run multiple

Not in project directory, assuming context of project at /Users/ash/projects/sanity/dev/test-studio

Error: Found multiple migrations for "multiple" in the /Users/ash/projects/sanity/dev/test-studio/migrations directory:
 - multiple.mjs
 - multiple.js
 - multiple.ts
 - multiple.cjs
 - multiple/index.mjs
 - multiple/index.js
 - multiple/index.ts
 - multiple/index.cjs

What to review

Do the adjusted output messages make sense?

Testing

Attempt to run migrations that are nonexistent, or have multiple matching scripts, from both a Studio project root directory and a Studio project subdirectory.

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Name	Status	Preview	Comments	Updated (UTC)
performance-studio	✅ Ready (Inspect)	Visit Preview		Mar 13, 2024 4:51pm
test-studio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 13, 2024 4:51pm

1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
studio-workshop	⬜️ Ignored (Inspect)	Visit Preview		Mar 13, 2024 4:51pm

[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Mar 13, 2024 4:54 PM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	31s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	6s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	12s	3	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	13s	4	2	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	12s	6	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	32s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	59s	15	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 3s	18	0	0
formBuilder/inputs/PortableText/RangeDecoration.spec.tsx	✅ Passed (Inspect)	12s	6	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	13s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	20s	9	0	0

[rexxars]

Looks good!