MAT-6896: Add decommission notice banner to login page (Bonnie-on-FHIR)

[jkotanchik-SB]

Pull requests into Bonnie require the following. Submitter and reviewer should ✅ when done. For items that are not-applicable, note it's not-applicable ("N/A") and ✅.

Submitter:

• This pull request describes why these changes were made.
• This PR is into the correct branch.
• JIRA ticket for this PR:
• JIRA ticket links to this PR
• Code diff has been done and been reviewed (it does not contain: additional white space, not applicable code changes, debug statements, etc.)
• If UI changes have been made, google WAVE plug-in has been executed to ensure no 508 issues were introduced.
• Tests are included and test edge cases
• Tests have been run locally and pass (remember to update Gemfile when applicable)
• Code coverage has not gone down and all code touched or added is covered.
  • In rare situations, this may not be possible or applicable to a PR. In those situations:
    1. Note why this could not be done or is not applicable here:
    2. Add TODOs in the code noting that it requires a test
    3. Add a JIRA task to add the test and link it here:
• Automated regression test(s) pass

If JIRA tests were used to supplement or replace automated tests:

• JIRA test links:
• Justification for using JIRA tests:
• JIRA tests have been added to sprint

Reviewer 1:

Name:

• Code is maintainable and reusable, reuses existing code and infrastructure where appropriate, and accomplishes the task’s purpose
• The tests appropriately test the new code, including edge cases

If JIRA tests were used to supplement or replace automated tests:

• JIRA tests have been run and pass
• You agree with the justification for use of JIRA tests or have provided input on why you disagree

Reviewer 2:

Name:

• Code is maintainable and reusable, reuses existing code and infrastructure where appropriate, and accomplishes the task’s purpose
• The tests appropriately test the new code, including edge cases
• You have tried to break the code

If JIRA tests were used to supplement or replace automated tests:

• JIRA tests have been run and pass
• You agree with the justification for use of JIRA tests or have provided input on why you disagree

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.87%. Comparing base (0c117df) to head (ac2e5ea).

Additional details and impacted files

@@               Coverage Diff               @@
##           bonnie-on-fhir    #2204   +/-   ##
===============================================
  Coverage           70.87%   70.87%           
===============================================
  Files                 140      140           
  Lines                8349     8349           
  Branches             1270     1270           
===============================================
  Hits                 5917     5917           
  Misses               1828     1828           
  Partials              604      604           

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