Support OpenSearch logo theming for light / dark modes

[AMoo-Miki]

Description

This change uses the imagery exposed by OSD for the login screen.

Issues Resolved

#1529

Check List

• New functionality includes testing
• New functionality has been documented
• Commits are signed per the DCO using --signoff

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[cwperks]

@AMoo-Miki This change looks good to me. The failing integ tests are unrelated to this change and currently being worked on: opensearch-project/security#3272

Looking into failing unit tests

[cwperks]

@AMoo-Miki Can you address the failing unit tests in login-page.test.tsx?

● Login page › handle submit event › submit click event

TypeError: Cannot read properties of undefined (reading 'logos')

  260 |           size="fullWidth"
  261 |           alt=""
> 262 |           url={props.config.ui.basicauth.login.brandimage || props.chrome.logos.OpenSearch.url}
      |                                                                           ^
  263 |         />
  264 |       )}
  265 |       <EuiSpacer size="s" />

[codecov]

Codecov Report

Merging #1568 (75e295a) into main (f655ccf) will not change coverage.
The diff coverage is 33.33%.

@@           Coverage Diff           @@
##             main    #1568   +/-   ##
=======================================
  Coverage   66.18%   66.18%           
=======================================
  Files          93       93           
  Lines        2339     2339           
  Branches      312      312           
=======================================
  Hits         1548     1548           
  Misses        722      722           
  Partials       69       69           

Files Changed	Coverage Δ
public/apps/customerror/custom-error.tsx	0.00% <0.00%> (ø)
public/apps/login/login-app.tsx	0.00% <0.00%> (ø)
public/apps/login/login-page.tsx	75.78% <100.00%> (ø)

[peternied]

@AMoo-Miki Do you want to get this in for 2.10? The window is closing in pretty fast

[cwperks]

@peternied This is blocked by opensearch-project/security#3278

Once the security PR is merged I will re-run the CI

[peternied]

Issue from the security plugin has been merged into main [1], I've retriggered the integration tests.

• [1] [BUG] Fix roles verification for roles mapping and internal users security#3278