Improve the revert Branding confirmation and default app-wise branding messages

[savindi7]

Purpose

Add a generic revert branding confirmation message to all use cases including B2B scenarios.

Add notification message to inform on the default branding set when app-wise branding is not applied.

Related Issues

• Implement app-wise branding feature product-is#21201

Related PRs

• N/A

Checklist

• e2e cypress tests locally verified. (for internal contributers)
• Manual test round performed and verified.
• UX/UI review done on the final implementation.
• Documentation provided. (Add links if there are any)
• Relevant backend changes deployed and verified
• Unit tests provided. (Add links if there are any)
• Integration tests provided. (Add links if there are any)

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines
• Ran FindSecurityBugs plugin and verified report
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 31.79%. Comparing base (8f7beb2) to head (bbe9190).
Report is 20 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6976   +/-   ##
=======================================
  Coverage   31.79%   31.79%           
=======================================
  Files          41       41           
  Lines         890      890           
  Branches      204      220   +16     
=======================================
  Hits          283      283           
+ Misses        607      557   -50     
- Partials        0       50   +50     

Flag	Coverage Δ
@wso2is/core	31.79% <ø> (ø)

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see 14 files with indirect coverage changes

[wso2-jenkins-bot]

🦋 Changeset detected

The changes in this PR will be included in the next version bump.

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