Add environment variable for setting vespa search threads

[pablonyx]

Description

Allows users to specify the number of search threads in Vespa

Fixes Dan-606

• relevant docs: Add vespa search threads documentation#123

How Has This Been Tested?

[Describe the tests you ran to verify your changes]

Accepted Risk

[Any know risks or failure modes to point out to reviewers]

Related Issue(s)

[If applicable, link to the issue(s) this PR addresses]

Checklist:

• All of the automated tests pass
• All PR comments are addressed and marked resolved
• If there are migrations, they have been rebased to latest main
• If there are new dependencies, they are added to the requirements
• If there are new environment variables, they are added to all of the deployment methods
• If there are new APIs that don't require auth, they are added to PUBLIC_ENDPOINT_SPECS
• Docker images build and basic functionalities work
• Author has done a final read through of the PR right before merge

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Name	Status	Preview	Comments	Updated (UTC)
internal-search	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 12, 2024 3:28am