fix: remove linea mainnet feature toggle

[VGau]

Description

• Removed Linea mainnet feature toggle and related functions and conditions
• Removed Linea mainnet not released warning message

Screenshots/Recordings

If applicable, add screenshots and/or recordings to visualize the before and after of your change

Issue

fixes #???

Checklist

• There is a related GitHub issue
• Tests are included if applicable
• Any added code is fully documented

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[sethkfman]

E2E: https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/530b8258-77f3-4b95-84b6-981a94a4118c

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.01% ⚠️

Comparison is base (ad9793b) 34.43% compared to head (55eb86e) 34.43%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7223      +/-   ##
==========================================
- Coverage   34.43%   34.43%   -0.01%     
==========================================
  Files        1016     1016              
  Lines       27089    27066      -23     
  Branches     2206     2204       -2     
==========================================
- Hits         9329     9321       -8     
+ Misses      17267    17253      -14     
+ Partials      493      492       -1     

Files Changed	Coverage Δ
app/components/Nav/Main/index.js	7.37% <ø> (+0.66%)	⬆️
...mponents/Views/NetworkSelector/NetworkSelector.tsx	63.33% <ø> (-1.82%)	⬇️
...omponents/Views/Settings/NetworksSettings/index.js	3.80% <ø> (+0.07%)	⬆️
app/constants/urls.ts	100.00% <ø> (ø)
app/util/networks/index.js	75.38% <ø> (-0.38%)	⬇️

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sethkfman]

E2E Passing: https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/530b8258-77f3-4b95-84b6-981a94a4118c

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[sethkfman]

LGTM