Add NavigationObserver script, fixes MudStaticCheckBox

[ScarletKuro]

Addressed the static checkbox issue: #471 (comment)

Need confirmation to be merged.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[ScarletKuro]

From discord:

Tested this fix and works for me.  Goto Login page, Remember me works, goto Register, Click Back to Login page and now Remember Me checkbox works again with 2.11  and adding the js to app.razor.

The above steps failed in 2.10 and 2.11 (without the js).