fix(deb): respect apt Deb822 source files

[jbetala7]

Description

Fixes #10011.

When Ubuntu's apt modernize-sources converts warpdotdev.list to the Deb822 warpdotdev.sources format, a later package postinst run sees that warpdotdev.list is missing and recreates it. That leaves both files configured for the same repo and causes duplicate-source warnings during apt update.

This change treats an existing @@REPO_NAME@@.sources file as an already-configured repo source. If a stale legacy .list file is present alongside it, postinst removes the .list file so the Deb822 source remains the single source of truth. On purge, postrm now removes both .list and .sources formats.

Linked Issue

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Where appropriate, screenshots or a short video of the implementation are included below (especially for user-visible or UI changes). N/A; packaging script change.

Testing

• sh -n resources/linux/debian/common/postinst.repo.template
• sh -n resources/linux/debian/common/postrm.repo.template
• bash -n script/linux/bundle_deb
• git diff --check
• Simulated postinst with fake apt-config: existing warpdotdev.sources plus stale warpdotdev.list keeps .sources and removes .list; fresh state with neither source creates .list as before.
• Simulated generated postrm purge with fake apt-config: removes signing key, .list, and .sources.

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@jbetala7

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Overview

This PR updates the Debian package scripts so post-install recognizes an existing Deb822 @@REPO_NAME@@.sources file, removes a stale duplicate .list file when Deb822 is present, and removes both source formats during purge.

Concerns

• No blocking correctness or security concerns found in the changed lines.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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[acarl005]

Thanks for the fix. Closing this in favor of #10019