Add Ship package labels

[Widcket]

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

📋 Changes

This PR adds a new packageLabel property to the Ship config files for each package (auth0_flutter and auth0_flutter_platform_interface).

Going forward, releases will be tagged separately for each package, as the release automation introduced in #278 needs separate tags. The value of packageLabel will be prepended to each tag, matching the values defined in the respective GitHub actions workflow:

• For auth0_flutter: https://github.com/auth0/auth0-flutter/blob/main/.github/workflows/publish-af.yml#L6
• For auth0_flutter_platform_interface: https://github.com/auth0/auth0-flutter/blob/main/.github/workflows/publish-afpi.yml#L6

This way, creating a labeled tag will kick off the release action for the respective package.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (253209a) 96.08% compared to head (eb71339) 95.79%.
Report is 9 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #325      +/-   ##
============================================
- Coverage     96.08%   95.79%   -0.30%     
============================================
  Files            97       76      -21     
  Lines          1611     1118     -493     
  Branches        331      281      -50     
============================================
- Hits           1548     1071     -477     
+ Misses           49       46       -3     
+ Partials         14        1      -13     

Flag	Coverage Δ
auth0_flutter	100.00% <ø> (ø)
auth0_flutter_android	?
auth0_flutter_ios	?
auth0_flutter_platform_interface	87.03% <ø> (ø)

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see 23 files with indirect coverage changes

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