Add JavaScriptEventLoopTestSupport module to install executor

[github-actions[bot]]

Time Change: +31ms (0%)

Total Time: 22,482ms

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import	28ms	-6ms (21%)	🎉
Serialization/JavaScript function call through Wasm import with int	25ms	-3ms (10%)	👏

View Unchanged

| Test name | Duration | Change | | :--- | :---: | :---: | | Serialization/JavaScript function call from Swift | 248ms | +12ms (4%) | | Serialization/Swift Int to JavaScript with assignment | 546ms | -2ms (0%) | | Serialization/Swift Int to JavaScript with call | 1,638ms | +8ms (0%) | | Serialization/JavaScript Number to Swift Int | 598ms | +23ms (3%) | | Serialization/Swift String to JavaScript with assignment | 635ms | -4ms (0%) | | Serialization/Swift String to JavaScript with call | 1,770ms | -2ms (0%) | | Serialization/JavaScript String to Swift String | 7,018ms | -99ms (1%) | | Object heap/Increment and decrement RC | 9,959ms | +111ms (1%) |

View Baselines

| Test name | Duration | | :--- | :---: | | Serialization/Call JavaScript function directly | 2ms | | Serialization/Assign JavaScript number directly | 3ms | | Serialization/Call with JavaScript number directly | 5ms | | Serialization/Write JavaScript string directly | 3ms | | Serialization/Call with JavaScript string directly | 3ms |

[kateinoigakukun]

Thank you for quick review :)