Revert "[CDP] introduce Inspector.workerScriptLoaded"

This reverts commit 022b53e3fb2c5fd52e4be026fad5097de1a52b17.

Reason for revert:
LUCI Bisection has identified this change as the cause of a test failure. See the analysis: https://ci.chromium.org/ui/p/chromium/bisection/test-analysis/b/6242229220802560

Sample build with failed test: https://ci.chromium.org/b/8700937344516775633
Affected test(s):
[ninja://:blink_web_tests/inspector-protocol/target/target-send-message.js](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2F:blink_web_tests%2Finspector-protocol%2Ftarget%2Ftarget-send-message.js?q=VHash%3Adae5f96b53c0ec12)

If this is a false positive, please report it at http://b.corp.google.com/createIssue?component=1199205&description=Analysis%3A+https%3A%2F%2Fci.chromium.org%2Fui%2Fp%2Fchromium%2Fbisection%2Ftest-analysis%2Fb%2F6242229220802560&format=PLAIN&priority=P3&title=Wrongly+blamed+https%3A%2F%2Fchromium-review.googlesource.com%2Fc%2Fchromium%2Fsrc%2F%2B%2F7016867&type=BUG

Original change's description:
> [CDP] introduce Inspector.workerScriptLoaded
>
> This event tells when the main worker script, and all imported
> scripts, have been evaluated. Most of the time, accessing worker
> before this moment is useless, as you get an empty context.
>
> Now clients can setup the worker before the main script is evaluated,
> then call Runtime.runIfWaitingForDebugger, and then wait until the
> main script is evaluated before evaluating anything in the fully
> setup worker.
>
> Bug: 407795731
> Change-Id: Ie800a17dae42810e077c7c0bf49f0821d728a674
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7016867
> Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
> Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1530173}
>

Bug: 407795731
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: Ie6c5035c66b3ff0199dabc87c0cd5aa5074eea70
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7045937
Owners-Override: Giovanni Ortuno Urquidi <ortuno@chromium.org>
Reviewed-by: Giovanni Ortuno Urquidi <ortuno@chromium.org>
Commit-Queue: Giovanni Ortuno Urquidi <ortuno@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1530214}