fix: update selectedGasFeeToken when payment token is selected for ga…

[pedronfigueiredo]

…sless flow cp-7.62.1

cherry-pick of #25209

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---

Note

Improves gasless deposit handling and simplifies fee token plumbing.

• Updates useTransactionPayToken to set selectedGasFeeToken (and isGasFeeTokenIgnoredIfBalance) when a pay token is chosen for predictDeposit, with tests
• Removes gasFeeToken usage across Predict/Perps deposit flows: deletes field from provider types, Polymarket provider return, controller submissions, and related tests
• Adds a guard in PerpsController.depositWithConfirmation to throw when NetworkController.findNetworkClientIdByChainId returns no client
• Test scaffolding updated (Engine mocks, transaction submission) accordingly

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⏭️ Smart E2E selection skipped - base branch is not main (base: release/7.62.1)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
86.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[metamaskbot]

No release label on PR. Adding release label release-7.62.1 on PR, as PR was added to branch 7.62.1 when release was cut.