[E2E] Add timestamp to unique name

[rclarey]

Changes

Add a timestamp to the unique name given to E2E directories. This allows a cleanup job to run and delete directories older than a given threshold

Tests

None

[github-actions]

If integration tests don't run automatically, an authorized user can run them manually by following the instructions below:

Trigger:
go/deco-tests-run/vscode

Inputs:

• PR number: 2119
• Commit SHA: c3b0f1b040b6aff9fb3001964fdf3cbf8e07c650

Checks will be approved automatically on success.

[rugpanov]

🤖 Integration tests ✅ all 35 test jobs passed for c3b0f1b0.
View run

[rugpanov]

LGTM — reviewed the change to getUniqueResourceName. Name-length and charset constraints are fine (worst case well under the 4096-byte job-name limit), collision resistance is unchanged/improved, and no existing test parses the name format, so this is backward-compatible.

One non-blocking suggestion: the vscode_integration_test_<ms>_<uuid> format is now effectively a contract consumed by the external cleanup job. A short comment pointing at that job (and, ideally, a tiny test pinning the format) would guard against a future refactor silently breaking cleanup. Legacy UUID-only directories created before this merge won't carry a parseable timestamp, so the cleanup job will need to handle those separately.

[rugpanov]

Review suggestions (non-blocking) — no blocking issues found across the review.

1. The vscode_integration_test_<ms>_<uuid> format is now effectively a contract for the external cleanup job. A comment referencing that job (and a small test pinning the format) would prevent a future refactor silently breaking cleanup.
2. Legacy UUID-only directories created before this change carry no parseable timestamp, so the cleanup job needs to handle them separately.