[release/8.0] Fix navigation for anchor inside <svg> element

[MackinnonBuck]

[release/8.0] Fix navigation for anchor inside <svg> element

Backport of #51706

Fixes multiple issues involving navigations initiated by clicks on <a> elements used in conjunction with <svg> elements.

Description

Makes the following improvements to how navigation interacts with <svg> elements:

• Allows <a> elements inside <svg> elements to initiate enhanced navigations: Enhanced Navigation doesn't work inside SVG element #51705
• Allows <svg> elements to be marked with data-enhance-nav="false" to disable enhanced navigation: data-enhance-nav=false is ignored on <svg> elements #51440
• Allows <a> elements containing <svg> elements to disable enhanced navigation via data-enhanced-nav="false": Blazor web app (dotnet 8): data-enhance-nav="false" is not working when tag <a/> is wrapping some <svg/> #52205

Fixes #51705
Fixes #51440
Fixes #52205

Customer Impact

Variations of this issue have been reported by several customers. Two of the abovementioned issues were reported before 8.0 GA, but this fix didn't make the GA cutoff. Since GA, a third variation of this issue has been reported, and it has received a couple upvotes by the community. There's no known workaround for these issues.

Regression?

• Yes
• No

This behavior has existed since the introduction of enhanced navigation (.NET 8).

Risk

• High
• Medium
• Low

The change is straightforward and pertains to a well-tested area of the framework.

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

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