chore: change name of integ test snapshot directories in preparation of multi-language integration tests

[mrgrain]

To support multi language integration tests better (see #22521), we need to rename the snapshot directories. Other languages have different naming conventions, so it's not trivial anymore to generate a "nice" name just from a test file. Instead we now use the full filename. This new pattern is inspired by Jest etc that all use the full filename.

E.g. my-test-name.integ.snapshot -> integ.my-test-name.js.snapshot

This PR changes the code generating the snapshot names and then does the rename in one go via the following commits:

• chore: change code for generating the integ test snapshot directory names
• chore: rename test data in integ-runner
• chore: update .gitignore files with new snapshot patterns
• chore: rename all integ-test snapshots
• chore: update integ test snapshot paths in docs
• chore: update .npmignore files with new snapshot pattern
• chore: update prlinter to detect new snapshot pattern

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Review by commit (start here). The middle commit contains most of the renames, is HUGE and takes a long time to load in the GitHub UI. However it only contains renames (use --diff-filter=r to exclude renames from the diff):

> git show --diff-filter=r fee824d161
(empty result)

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All Submissions:

• Have you followed the guidelines in our Contributing guide?

Adding new Unconventional Dependencies:

• This PR adds new unconventional dependencies following the process described here

New Features

• Have you added the new feature to an integration test?
  • Did you use yarn integ to deploy the infrastructure and generate the snapshot (i.e. yarn integ without --dry-run)?

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 7b8999f
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