Add add-mask functionality to proxy-exec

Arran Walkerrequested to merge
ajwalker/proxy-exec-masking into main

What does this MR do?

Adds ::add-mask:: dynamic masking support to proxy-exec binary.

Why was this MR needed?

This allows users to dynamically mask secrets by echoing them to the job log.

What's the best way to test this MR?

What are the relevant issue numbers?

Closes #38593 (closed)

Closes #38624 (closed)

#38465 (closed)

Edited by Arran Walker

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