TINYMCE-14879: Fixes for Safari 26 and test stability

[TheSpyder]

Related Ticket: TINYMCE-14879

Description of Changes:

• New option that helps run bedrock's remote browser in a playwright docker image
• Fixed LT on remote Safari 26+
• Adjusted test pings to reduce edge case activations of the 55 second timeout incorrectly
• Fixed minor bug in grunt options

Pre-checks:

• Changelog entry added
• package.json versions have not been changed (done by Lerna on release)
• Tests have been added (if applicable)

Before merging:

• Ensure internal dependencies are on appropriate versions
  • For stable releases, all dependencies must be stable
  • For release candidates, all dependencies must be release candidates or stable