PSS: Swap to gating the experimental feature using configuration, instead of CLI flags#38007

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SarahFrench wants to merge 8 commits intomainfrom

pss/change-experiment-control

Commits on Dec 17, 2025

test: Fix pre-existing subtest name
SarahFrench
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refactor: Gate pluggable state storage experiment behind the experiment `pluggable_state_stores`. This is defined via configuration, instead of the old CLI flag `-enable-pluggable-state-storage-exp…
SarahFrench
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test: Add a new test that shows PSS cannot be used if the `pluggable_state_stores` experiment isn't declared in the config.
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test: Make tests tolerant of warnings in the returned diagnostics
SarahFrench
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fix: Avoid losing diagnostics raised when we parse config in `(c *InitCommand) Run`, instead pass config and diags into downstream code.
SarahFrench
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test: Fix test and update override files to not include any experiment lists in the terraform block.
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fix: Allow detection of experiments in config early in init, but re-parse the root module after it might have been impacted by use of the -from-module flag (parsing may yield something different th…
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fix: Parse root module at appropriate time when -from-module is used. This is necessary because parsing a second time results in diagnostics being suppressed, and the last commit's approach risked …
SarahFrench
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