[Bundle Caching][Worker] Cache parent BAR if the commit's BAR doesn't exist

[JerrySentry]

In the BundleAnalysisReportService.process_upload:
do something like:

# fetch existing bundle report from storage
bundle_report = bundle_loader.load(commit_report.external_id)

# carry over parent bundle analysis report if commit doesn't have
if bundle_report is None:
    bundle_report = _previous_bundle_analysis_report(bundle_loader, commit)
    # bundles_to_be_cached = fetch all bundles for this repo_id in the BundleConfig table where is_caching=True
    # for bundle in bundle_report that exists in bundles_to_be_cached -> call `update_is_cached(name, True)
    # for bundle in bundle_report that dne in bundles_to_be_cached -> call `delete_bundle_by_name(name)

# fallback to create a fresh bundle analysis report
if bundle_report is None:
    bundle_report = BundleAnalysisReport()

What this does is it will do a automatic full carry forward of the parent commit with all its bundles. Afterwards any actual uploads for this commit will be overwriting whatever the bundles that got carried over (this logic already exists).

Note that this will not selectively figure out which bundle names it should cache or not (as it will just cache every bundle), that work will be done in another ticket.

Also note that we don't know yet what bundles were carried over vs what is from the actual commit's upload, we need to differentiate this because we need to tell the user which bundles are cached and which is not

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