fix(website): replace isStaging conditionals with byEnv in RSV-A/B wastewater config

[fhennig]

Summary

• Replaces leftover isStaging ? X : Y conditionals in wastewaterConfig.ts that were introduced as a rebase artifact
• Converts them to byEnv(env, { prod, staging, local }) calls consistent with the rest of the file
• Affects collectionsUserId (RSV-A, RSV-B) and variant filter collectionId (RSV-A: local=21, RSV-B: local=74)

Test plan

• TypeScript build passes without Cannot find name 'isStaging' errors
• RSV-A and RSV-B wastewater pages load correctly on staging and production

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
dashboards	Ready	Preview, Comment	Jun 25, 2026 2:02pm

[Copilot]

Pull request overview

This PR fixes a rebase artifact in the website’s wastewater configuration by replacing leftover isStaging ? X : Y conditionals (which were not in scope / not defined in this file) with the existing byEnv(env, { prod, staging, local }) helper pattern already used elsewhere in wastewaterConfig.ts.

Changes:

• Replaced isStaging ternaries with byEnv(...) for RSV-A/RSV-B predefinedVariantsSource.collectionsUserId.
• Replaced isStaging ternaries with byEnv(...) for RSV-A/RSV-B variant filter collectionId, adding explicit local IDs (RSV-A: 21, RSV-B: 74).

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