o/devicestate, o/snapstate: improve firstboot task order

[ernestl]

Make corrections to firstboot install task order according to spec SD154 | Firstboot install task order

This task draws inspiration from earlier, dated work to achieve the same: #13127

enable firstboot to request configuration using gadget defaults instead of injecting the task itself

• Adapting install code to generate configuration task, using gadget defaults, for essential snaps: core, gadget and kernel to avoid injecting configure tasks from the first boot install code. The exception remains when core snap is not installed, a configuration need to be injected.
• Introduced configure edge, that is required to provide reference for reorganizing the install taskset within the firstboot code.
• None of the tests are affected at this point, but little more simplification is required once the firstboot code changes and stop injecting configure hooks for essential snaps.

JIRA: https://warthogs.atlassian.net/browse/SNAPDENG-7297

[github-actions]

Sun Feb 9 22:26:26 UTC 2025

Spread tests skipped

[codecov]

Codecov Report

Attention: Patch coverage is 67.56757% with 108 lines in your changes missing coverage. Please review.

Please upload report for BASE (master@81fd929). Learn more about missing BASE report.
Report is 181 commits behind head on master.

Files with missing lines	Patch %	Lines
...lord/devicestate/devicestatetest/task_run_order.go	0.00%	85 Missing ⚠️
overlord/devicestate/firstboot.go	91.48%	12 Missing and 4 partials ⚠️
overlord/snapstate/snapstate.go	88.09%	4 Missing and 1 partial ⚠️
overlord/snapstate/target.go	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #15015   +/-   ##
=========================================
  Coverage          ?   78.09%           
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  Files             ?     1171           
  Lines             ?   157042           
  Branches          ?        0           
=========================================
  Hits              ?   122637           
  Misses            ?    26795           
  Partials          ?     7610           

Flag	Coverage Δ
unittests	78.09% <67.56%> (?)

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