fix: decompress devtools discovery html

[nornagon]

Description of Change

Beginning with
https://chromium.googlesource.com/chromium/src/+/6b83ee683f6c545be29ee807c6d0b6ac1508a549,
rolled into Electron with #23219, grit compresses html/js/css/svg by default.
We were serving the raw resource for the devtools discovery page (shown when
using --remote-debugging-port=9092), which was serving a raw gzipped page. We
now use a more appropriate accessor which decompresses if needed.

Fixes #25570.

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• tests are changed or added
• PR title follows semantic commit guidelines
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Fixed the remote-debugging-port discovery page showing garbled text.

[nornagon]

CI failure unrelated; merging.

[release-clerk]

Release Notes Persisted

Fixed the remote-debugging-port discovery page showing garbled text.

[trop]

I have automatically backported this PR to "10-x-y", please check out #25601

[trop]

I have automatically backported this PR to "11-x-y", please check out #25602