ci: Add Linux Snap Store deployment

[imaNNeo]

Description

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Checklist

• I have followed the Contributor Guide when preparing my PR.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation and added dartdoc comments with ///.
• I have updated/added relevant examples in example.

Breaking Change?

• Yes, this PR is a breaking change.
• No, this PR is not a breaking change.

Related Issues

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.13%. Comparing base (a9147f0) to head (b13deb7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2087   +/-   ##
=======================================
  Coverage   94.13%   94.13%           
=======================================
  Files          54       54           
  Lines        4675     4675           
=======================================
  Hits         4401     4401           
  Misses        274      274           

Flag	Coverage Δ
flutter	94.13% <ø> (ø)

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