build: add parallel and concurrency flags to test:ci and build:ci

[devin-ai-integration]

PR Description

Add --concurrency=100% flag to test:ci and build:ci scripts to improve build performance.

Link to Devin run: https://app.devin.ai/sessions/dd4793dbc12f4887b1cf0d780499703c
Requested by: Jayant

[devin-ai-integration]

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Name	Status	Preview	Comments	Updated (UTC)
api-reference	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 8, 2025 4:18am
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[devin-ai-integration]

Closing this PR as it did not improve build performance.