Add support to persist pip reports

[pauld-msft]

The primary use case here is when the same build stage has both Component Detection and SBOM (where CD runs again). This will allow whichever comes second to be able to just use the previous runs' reports, rather than regenerating them.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Project coverage is 76.4%. Comparing base (924c4ea) to head (6fec1cf).

Files	Patch %	Lines
...ection.Detectors/pip/PipReportComponentDetector.cs	33.3%	3 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1224 +/- ## ======================================= + Coverage 75.8% 76.4% +0.6% ======================================= Files 258 258 Lines 11668 11671 +3 Branches 1179 1180 +1 ======================================= + Hits 8847 8925 +78 + Misses 2479 2406 -73 + Partials 342 340 -2 ```

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[github-actions[bot]]

👋 Hi! It looks like you modified some files in the Detectors folder. You may need to bump the detector versions if any of the following scenarios apply:

• The detector detects more or fewer components than before
• The detector generates different parent/child graph relationships than before
• The detector generates different devDependencies values than before

If none of the above scenarios apply, feel free to ignore this comment 🙂