re-add system contact shortcut

[fm-sys]

Contributor checklist

• I am following the Code Style Guidelines
• I have tested my contribution on these devices:

• Emulator, Android API 33

• My contribution is fully baked and ready to be merged as is
• I ensure that all the open issues my contribution fixes are mentioned in the commit message of my first commit using the Fixes #1234 syntax

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Description

Around half a year ago when the conversation fragment was largely rewritten, the long click shortcut to access the system contact was (accidentally?) removed. I thought I would get used to it, but I'm still missing that option... I would really appreciate it if it was readded.

With this PR merged, long-clicking the contact name in the conversation action bar will open the system contact if available.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[fm-sys]

Hey @cody-signal @greyson-signal,

Could you be so kind to at least drop off a short message, no matter whether or not this PR gets accepted... Thank you!

Best regards
Florian

[alex-signal]

Hi! I'll run this by the team and make sure we want this functionality reintroduced.