chore(ssi): improve telemetry submitted for ssi configurations

[mabdinur]

• Ensure config._lib_was_injected is set to True when SSI is successful. Currently this configuration is always set to False even when SSI is successful.
• Use DD_INJECTION_ENABLED to track whether SSI was attempted. This env_var is set by the injector and is used by other SDKs.

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions]

CODEOWNERS have been resolved as:

ddtrace/bootstrap/sitecustomize.py                                      @DataDog/apm-core-python
ddtrace/settings/_config.py                                             @DataDog/apm-core-python
lib-injection/sources/sitecustomize.py                                  @DataDog/apm-core-python
tests/telemetry/test_writer.py                                          @DataDog/apm-python

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and base.

Summary

The average import time from this PR is: 232 ± 3 ms.

The average import time from base is: 234 ± 2 ms.

The import time difference between this PR and base is: -2.1 ± 0.1 ms.

Import time breakdown

The following import paths have shrunk:

ddtrace.auto 1.949 ms (0.84%)

ddtrace.bootstrap.sitecustomize 1.278 ms (0.55%)

ddtrace.bootstrap.preload 1.278 ms (0.55%)

ddtrace.internal.products 1.278 ms (0.55%)

ddtrace.internal.remoteconfig.client 0.628 ms (0.27%)

ddtrace 0.671 ms (0.29%)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-05-02 18:12:17

Comparing candidate commit 399e407 in PR branch munir/track-injection-configs with baseline commit 8fe0cfa in branch main.

Found 0 performance improvements and 4 performance regressions! Performance is the same for 503 metrics, 5 unstable metrics.

scenario:iast_aspects-ljust_aspect

• 🟥 execution_time [+1.159µs; +1.329µs] or [+8.841%; +10.133%]

scenario:iast_aspects-ospathnormcase_aspect

• 🟥 execution_time [+425.703ns; +477.172ns] or [+12.494%; +14.004%]

scenario:iast_aspects-ospathsplitdrive_aspect

• 🟥 execution_time [+517.652ns; +593.754ns] or [+14.416%; +16.535%]

scenario:iast_aspects-upper_aspect

• 🟥 execution_time [+171.555ns; +238.967ns] or [+7.487%; +10.429%]

[bm1549]

LGTM, pending discussion on the doc

[mabdinur]

blocked by: https://github.com/DataDog/dd-go/pull/181667/files