Upgrade to Go 1.27

[Sovietaced]

Why are the changes needed?

New versions of Go include new features, performance improvements, and security fixes. See: https://go.dev/doc/go1.27

What changes were proposed in this pull request?

Leveraged Go 1.27 to do the following

1. Converted futures, auto-refresh cache, and scheduler timing tests to testing/synctest.
2. Migrated service-client HTTP tests to Go 1.27’s in-memory httptest.NewTestServer.
3. Modernized reverse event traversal with slices.Backward.
4. Ran the atomictypes, slicesbackward, and unsafefuncs fixers. Only the reverse-loop change was safely applicable.

How was this patch tested?

Labels

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• added: For new features.
• changed: For changes in existing functionality.
• deprecated: For soon-to-be-removed features.
• removed: For features being removed.
• fixed: For any bug fixed.
• security: In case of vulnerabilities

This is important to improve the readability of release notes.

Setup process

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Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

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Docs link

[Sovietaced]

Go 1.27 changed the compress/flate implementation, so gzip output can produce different—but equally valid—compressed bytes.
The Azure test previously asserted the entire generated URL, including a hard-coded base64-encoded gzip payload. After upgrading Go, that byte-for-byte value changed even though the decompressed Azure query was identical.
I changed this to verify the meaningful behavior:

1. Check the Azure URL prefix and log metadata.
2. URL-decode the query.
3. Base64-decode it.
4. Gzip-decompress it.
5. Compare the resulting query text with the expected query.
   So it was a test-stability adjustment required by Go 1.27’s compression change, not a production behavior change. It also avoids future failures when compression output changes without changing its contents.

[popojk]

Thanks for your contribution. I just left 2 small comments.