Static analyses changes

[RiccardoM]

Description

Improved the static analyses checks to be more strict

Checklist

• [ ] Targeted PR against correct branch.
• [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [ ] Wrote unit tests.
• [ ] Run flutter format.
• [ ] Updated the documentation.
• [ ] Added an entry to the CHANGELOG.md file.
• [ ] Re-reviewed Files changed in the Github PR explorer.

[codecov[bot]]

Codecov Report

Merging #144 into ui-fixes will increase coverage by 0.01%. The diff coverage is 59.64%.

@@             Coverage Diff              @@
##           ui-fixes     #144      +/-   ##
============================================
+ Coverage     63.57%   63.58%   +0.01%     
============================================
  Files           277      277              
  Lines          7151     7146       -5     
============================================
- Hits           4546     4544       -2     
+ Misses         2605     2602       -3     

Impacted Files	Coverage Δ
lib/entities/mnemonic/mnemonic_data.dart	77.77% <ø> (ø)
...ities/notifications/transaction_notifications.dart	92.30% <ø> (ø)
lib/entities/posts/link_preview.dart	4.76% <0.00%> (ø)
lib/entities/posts/polls/poll_answer.dart	53.84% <ø> (ø)
lib/entities/posts/polls/poll_option.dart	53.84% <0.00%> (ø)
lib/entities/posts/post_status.dart	76.00% <ø> (ø)
lib/entities/user/user.dart	96.42% <ø> (ø)
lib/entities/user/user_image.dart	97.50% <ø> (ø)
lib/sources/chain/models/msgs/chain_poll_data.dart	0.00% <ø> (ø)
...b/sources/chain/models/msgs/chain_poll_option.dart	0.00% <ø> (ø)
... and 128 more

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