Fix query to avoid nullable fields in select for update in processOldStreams job

[garrrikkotua]

Changes proposed ✍️

What

🤖 Generated by Copilot at 0390bf5

Improved the performance of the integration stream worker by optimizing the SQL query in integrationStream.repo.ts.
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🤖 Generated by Copilot at 0390bf5

We're sailing on the integrationStream tonight
We've got to fetch and lock the webhooks right
So pull the rope and sing along with me
We've simplified the SQL query

Why

How

🤖 Generated by Copilot at 0390bf5

• Simplify and format SQL query to fetch and lock pending incoming webhooks (link, link) in integrationStream.repo.ts

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screenshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.