Andrey Antukh 84d92cfd5a
✨ Add tail buckets and update-file validation timings (#12409)
* ✨ Extend backend histogram buckets beyond 7.5s

Give every backend timing histogram a tail past the shared 7500ms cap
so slow RPC calls, CLIMIT waits and background tasks report real
quantiles instead of clipping at the top bucket.

Request and wait metrics grow to 60s, background tasks to 300s and
Redis eval to 10s; the sub-7.5s buckets stay untouched to keep the
history comparable.

Closes #12408

AI-assisted-by: muse-spark-1.3-contributor

* 🐛 Fix flaky assertion in climit republish test

Read the last published waiting value instead of the exact
publication list. The sampler thread started with the component
runs its first tick asynchronously, and when it lands inside the
recording window it publishes the same count twice, which made
the full-suite CI run fail while focused runs stayed green.

AI-assisted-by: muse-spark-1.3-contributor

* ✨ Add file_data blob to JSON decode helper

Allow decoding file_data blobs (app.util.blob) to JSON
for investigations with jq, offline from a blob file or
from nREPL with the backend running.

AI-assisted-by: muse-spark-1.3-contributor

* ✨ Add validation step timings to update-file logs and metrics

Measure the six phases inside process-changes-and-validate
(resolve-libs, process-changes, soft and hard affected and
schema validations) with tpoint and try/finally, so timings
are recorded even when a hard validation throws.

Publish each phase to a new histogram
penpot_rpc_update_file_validation_timing with a fixed step
label using the request buckets (up to 60000 ms), and extend
the update-file debug log with the same *-ms fields plus
file, project and team ids. The deferred log only runs on
success, so failures get an inline error log with partial
timings.

AI-assisted-by: muse-spark-1.3-contributor

* 💄 Translate decode-file-data comments to English

Translate the Spanish docstrings, section headers and test
messages of the file_data decode helper to English, keeping
code untouched. The repo convention is English in code and
comments; the helper was first written in Spanish.

AI-assisted-by: muse-spark-1.3-contributor
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