Debug upload compression

[szokeasaurusrex]

Description

Adds documentation clarifying that the debug-files upload command does not apply whole-file compression to debug files. It details that compression occurs only at the transport level for individual chunks and that source bundle archives generated with --include-sources are separate artifacts, not a compression step for the original DIF.

Issues

Legal Boilerplate

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
_{Learn more about Cursor Agents}

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

### Features

- Debug upload compression ([#3117](https://github.com/getsentry/sentry-cli/pull/3117))

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Generated by 🚫 dangerJS against edbeaa8

[szokeasaurusrex]

Closing, this was just for an AI investigation.

Cc @JoshuaMoelans — the markdown file includes a full summary of the agent conversation in case you need any of this info for reference