Improve SSI

[lloeki]

What does this PR do?

General improvements to the current SSI injector bootstrap implementation

Motivation:

Some things are not quite covered.

Change log entry

Additional Notes:

How to test the change?

It's a bit hard right now, either we have small granularity CI but a lot of environmental invasion (rspec) or we have isolation but coarse granularity (vaccine). Working on it.

#4366

[github-actions]

👋 Hey @lloeki, please fill "Change log entry" section in the pull request description.

If changes need to be present in CHANGELOG.md you can state it this way

**Change log entry**

Yes. A brief summary to be placed into the CHANGELOG.md

(possible answers Yes/Yep/Yeah)

Or you can opt out like that

**Change log entry**

None.

(possible answers No/Nope/None)

^{Visited at: 2025-02-12 10:56:12 UTC}

[datadog-datadog-prod-us1]

Datadog Report

Branch report: lloeki/ssi
Commit report: 16d209e
Test service: dd-trace-rb

✅ 0 Failed, 20606 Passed, 1375 Skipped, 3m 19.08s Total Time

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.73%. Comparing base (0e4b45c) to head (16d209e).
Report is 151 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4366   +/-   ##
=======================================
  Coverage   97.73%   97.73%           
=======================================
  Files        1365     1365           
  Lines       83337    83337           
  Branches     4219     4219           
=======================================
  Hits        81447    81447           
  Misses       1890     1890           

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[pr-commenter]

Benchmarks

Benchmark execution time: 2025-02-21 12:57:12

Comparing candidate commit 16d209e in PR branch lloeki/ssi with baseline commit 0e4b45c in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 31 metrics, 2 unstable metrics.