fix(ui): update config at runtime to apply branding

[ciiay]

Description

Currently app.branding.iconLogo is not being injected during runtime, which leads favicon not updating from customization. This PR added a ConfigUpdater component to take the config at runtime so that customized iconLogo will be picked up as favicon.

Which issue(s) does this PR fix

• Fixes issue app.branding.iconLogo has no effect when running the downstream image #777
• RHIDP-2673

PR acceptance criteria

Please make sure that the following steps are complete:

• GitHub Actions are completed and successful
• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
• Add a screenshot if the change is UX/UI related

How to test changes / Special notes to the reviewer

Test data:

data: 
  app-config-rhdh.yaml: |
    app: 
      branding: 
        iconLogo: data:image/png;base64,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

Screenshots:
Chrome:

Firefox:

Note: Dynamically loads favicon is not supported by Safari yet.

[openshift-ci]

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[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-1381!

[ciiay]

/retest

[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-1381!

[ciiay]

/test e2e-tests

[ciiay]

/retest

[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-1381!