`conf/workers-shared-extra.yaml.j2` is applied to monolith Complement runs

[matrixbot]

This issue has been migrated from #13590.

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docker/complement/conf/workers-shared-extra.yaml.j2 seems to apply even when SYNAPSE_COMPLEMENT_USE_WORKERS=true isn't set. I assume they aren't supposed to stack like that for the monolith?

Noticed because I saw the reject_limit as 99999 when investigating matrix-org/synapse#13541 (comment). Disabling the rate limit could be as expected for the monolith but the way it's inherited from workers seems weird.

This is the command I was running for reference but it probably works in the simplified case as well,

TEST_ONLY_IGNORE_POETRY_LOCKFILE=1 TEST_ONLY_SKIP_DEP_HASH_VERIFICATION=1 COMPLEMENT_DEBUG=1 COMPLEMENT_KEEP_BLUEPRINTS="fed.perf_many_messages.hs1" COMPLEMENT_ALWAYS_PRINT_SERVER_LOGS=1 COMPLEMENT_DIR=../complement ./scripts-dev/complement.sh -run TestMessagesOverFederation -p 1

Dev notes

Related PRs:

• Move complement setup stuff into the Synapse repo matrix-org/synapse#12404
• Docker: copy postgres from base image matrix-org/synapse#13279