Closes #7230: Add downloads to the system download database for devices older than Q

[Amejia481]

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Pull Request checklist

• Quality: This PR builds and passes detekt/ktlint checks (A pre-push hook is recommended)
• Tests: This PR includes thorough tests or an explanation of why it does not
• Changelog: This PR includes a changelog entry or does not need one
• Accessibility: The code in this PR follows accessibility best practices or does not include any user facing features

After merge

• Milestone: Make sure issues closed by this pull request are added to the milestone of the version currently in development.
• Breaking Changes: If this is a breaking change, please push a draft PR on Reference Browser to address the breaking issues.

[codecov]

Codecov Report

Merging #7231 into master will increase coverage by 0.13%.
The diff coverage is 58.82%.

@@             Coverage Diff              @@
##             master    #7231      +/-   ##
============================================
+ Coverage     77.22%   77.36%   +0.13%     
- Complexity     4820     5049     +229     
============================================
  Files           649      674      +25     
  Lines         24025    24705     +680     
  Branches       3536     3641     +105     
============================================
+ Hits          18554    19113     +559     
- Misses         4008     4077      +69     
- Partials       1463     1515      +52     

Impacted Files	Coverage Δ	Complexity Δ
.../feature/downloads/AbstractFetchDownloadService.kt	71.27% <58.82%> (+2.18%)	64.00 <2.00> (+1.00)
...rt/migration/session/InMemorySessionStoreParser.kt	92.00% <0.00%> (-2.12%)	8.00% <0.00%> (ø%)
...onents/feature/app/links/RedirectDialogFragment.kt	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
.../mozilla/components/service/fretboard/Fretboard.kt	100.00% <0.00%> (ø)	21.00% <0.00%> (?%)
...ervice/fretboard/scheduler/jobscheduler/SyncJob.kt	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
...mponents/service/fretboard/JSONExperimentParser.kt	95.65% <0.00%> (ø)	27.00% <0.00%> (?%)
...s/service/fretboard/ExperimentDownloadException.kt	100.00% <0.00%> (ø)	2.00% <0.00%> (?%)
...omponents/service/fretboard/ExperimentEvaluator.kt	87.93% <0.00%> (ø)	39.00% <0.00%> (?%)
.../scheduler/workmanager/WorkManagerSyncScheduler.kt	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
...la/components/feature/app/links/AppLinkRedirect.kt	88.88% <0.00%> (ø)	16.00% <0.00%> (?%)
... and 19 more

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[kglazko]

Looks good besides a nit/question I mentioned

[Amejia481]

bors r=kglazko,NotWoods

[bors]

Build succeeded:

• complete-push