feat(paywalls): fall back to the offerings paywall when the workflow fetch fails

[vegaro]

Summary

• The config endpoint can be disabled for the session after a 4xx, be unreachable, or simply have no workflow for the offering yet. In all of those cases the offering still carries the paywall /offerings delivered, so render that through the regular components path instead of surfacing PaywallState.Error.
• The error state remains for offerings with nothing to fall back to.

Stacked on #3716.

Test plan

• :ui:revenuecatui:testDefaultsBc8DebugUnitTest

[vegaro]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• refactor(workflows): give ui_config its own independent read path #3710
• feat(paywalls): fall back to the offerings paywall when the workflow fetch fails #3709 👈 (View in Graphite)
• refactor(workflows): serve workflows from the config endpoint #3716
• refactor(workflows): add the workflows topic read path over the config endpoint #3723
• refactor(workflows): render workflows with ui_config from the config endpoint #3721
• UI Config via config endpoint #3711
• main

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.32%. Comparing base (8836042) to head (d41a4f2).

Additional details and impacted files

@@                           Coverage Diff                            @@
##           cesar/workflows-config-endpoint-rewrite    #3709   +/-   ##
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  Coverage                                    80.32%   80.32%           
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  Files                                          405      405           
  Lines                                        16576    16576           
  Branches                                      2377     2377           
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  Hits                                         13314    13314           
  Misses                                        2315     2315           
  Partials                                       947      947           

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