fix: xchain linea bugs

[infiniteflower]

Description

This PR fixes a couple of issues and does the following:

1. Shows a loading spinner on the Bridge button after submitting
2. Does not wait 5 sec to submit a bridge tx on Linea if there is no approval tx

Related issues

Fixes:

Manual testing steps

Gas token

1. Start a bridge from Linea to any chain for ETH
2. Observe that you are redirected to Activity page almost instantly

ERC20

1. Start a bridge from Linea to any chain for an ERC20
2. Observe that a loading spinner shows on the button
3. Observe you are redirected to Activity page after 5 sec

Screenshots/Recordings

Before

After

Screen.Recording.2024-12-20.at.4.08.00.PM.mov

Screen.Recording.2024-12-20.at.4.08.39.PM.mov

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[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.

[metamaskbot]

Builds ready [40994f4]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7
  • common: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 12, 13, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1906 ± 86 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	1659	2218	1907	173	83
		domContentLoaded	1620	2187	1871	160	77
		load	1658	2276	1906	180	86
		domInteractive	27	113	42	20	10
		backgroundConnect	8	109	38	34	16
		firstReactRender	17	178	64	41	20
		getState	6	102	30	33	16
		initialActions	0	1	0	0	0
		loadScripts	1056	1696	1394	158	76
		setupStore	7	81	27	27	13
		uiStartup	1917	3078	2389	327	157

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: 32 Bytes (0.00%)
• common: 0 Bytes (0.00%)