Run Pre-commit Secret Detection scans within Subprocess

What does this MR do and why?

This MR adds the implementation for running Secret Detection scan of each blob within the Subprocess for optimizing memory(see linked issue).

This MR also removes the implementation for skipping the lines ending with #gitleaks:allow keyword (Reasoning)

Closes #430160 (closed)

Reference Issue Numbers

• Pre-receive Secret Detection: Run regex operati... (#430160 - closed)

MR acceptance checklist

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