Set user interactions for tasks

[paulrouget]

fix #26026

I need help here. Retrieving the interaction flag from the promise handle crashes.

let interaction = GetPromiseUserInputEventHandlingState(promise);

Stack trace for thread "ScriptThread PipelineId { namespace_id: PipelineNamespaceId(1), index: PipelineIndex(1) }"
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /Users/paul/.cargo/git/checkouts/backtrace-rs-96ebaf1bcb788384/91a0aa4/src/backtrace/libunwind.rs:86
      backtrace::backtrace::trace_unsynchronized
             at /Users/paul/.cargo/git/checkouts/backtrace-rs-96ebaf1bcb788384/91a0aa4/src/backtrace/mod.rs:66
   1: <servo::backtrace::Print as core::fmt::Debug>::fmt
             at ports/glutin/backtrace.rs:49
   2: <&mut W as core::fmt::Write>::write_fmt
   3: std::io::Write::write_fmt
             at /rustc/45ebd5808afd3df7ba842797c0fcd4447ddf30fb/src/libstd/io/mod.rs:1427
   4: servo::backtrace::print
             at ports/glutin/backtrace.rs:17
   5: servo::install_crash_handler::handler
             at ports/glutin/main2.rs:68
   6: <unknown>
   7: _ZN2JS37GetPromiseUserInputEventHandlingStateENS_6HandleIP8JSObjectEE
             at /Users/paul/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/2392ebc/mozjs/js/src/vm/JSObject.h:106

[highfive]

Heads up! This PR modifies the following files:

• @asajeffrey: components/script/script_runtime.rs, components/script/dom/promise.rs, components/script/microtask.rs, components/script/timers.rs
• @KiChjang: components/script/script_runtime.rs, components/script/dom/promise.rs, components/script/microtask.rs, components/script/timers.rs

[highfive]

Warning

• These commits modify script code, but no tests are modified. Please consider adding a test!

[jdm]

There's a null promise object being passed in enqueue_promise_job. I'm doing a debugmozjs build to try to figure out why.

[jdm]

@paulrouget Judging by gecko and spidermonkey code, passing a null promise object is a valid state so I pushed a change that avoids the crash. I can successfully start immersive mode in the tennis demo on desktop now.

[paulrouget]

@bors-servo try

[bors-servo]

⌛ Trying commit 5621c88 with merge 98dbb86...

[bors-servo]

☀️ Test successful - status-taskcluster
State: approved= try=True

[paulrouget]

@jdm r?

[jdm]

@bors-servo r+

[bors-servo]

📌 Commit 5621c88 has been approved by jdm

[bors-servo]

⌛ Testing commit 5621c88 with merge 0ed0c0d...

[bors-servo]

☀️ Test successful - status-taskcluster
Approved by: jdm
Pushing 0ed0c0d to master...