[BUGFIX beta] Remove style warning when the binding is quoted

[Serabe]

Given the following template:

<div style="{{myStyle}}"></div>

It behaves exactly like:

<div style={{myStyle}}></div>

Fix #11395

[rwjblue]

This looks good, but we need more tests. Specifically, we need to add tests that ensure things like style="width: 100px; {{safeStringThingy}}" warns.

[Serabe]

Thank you for reviewing this, @rwjblue!

I've added three more tests. Let me know if you need me to add anything!

Thank you!

[Serabe]

@rwjblue did I add enough tests? The new tests added in this PR are:

• <div style="{{userValue}}"></div> with safe and unsafe strings.
• <div style="color: green; {{userValue}}"></div> with safe string.
• <div style="color: green; width: {{userValue}}"></div> with safe string.
• <div style="color: green; {{userProperty}}: 42px"></div> with safe string.

[Serabe]

Rebased and pushed to check CI

[rwjblue]

Thanks @Serabe!