favicon.ico is now in resourcePath

[dbarwikowski]

What this PR does / why we need it: favicon.ico is not loaded because UI searches for it in wrong place - ignores relative path that is used in IIS

Which issue(s) this PR fixes:

Please reference the issue this PR will close: partially #2293

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• [x] Code compiles correctly
• [x] Created/updated tests
• [x] Unit tests passing
• [x] End-to-end tests passing
• [x] Extended the documentation
• [x] Provided sample for the feature

[dbarwikowski]

@dotnet-policy-service agree