Prevent re-render of preview overlay when there are no changes

[jamesricky]

Description

When an input is rendered, it's name and type attributes change from null to their actual value.
This triggers a re-calculation of the preview overlays, due to #2682.
The re-calculation then causes a re-render of the site-content, which causes an infinite loop.
This is prevented by preventing a re-render when no values of IFrameBridgeContext are changed.

This issue does not seem to occur with other elements, such as textarea or select.

Acceptance criteria

• I have verified if my change requires an example
• I have verified if my change requires a changeset
• I have verified if my change requires screenshots/screencasts

Open TODOs/questions

• Add changeset

Further information

• Task: https://vivid-planet.atlassian.net/browse/SVK-518
• To reproduce the issue, see Reproduce infinite loop of re-rendering block in admin-preview due to rendering an input tag #3085
• Alternative to Prevent unresponsive Admin UI of block-preview when rendering an input element in the frontend #3093

[sonarqubecloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud