Fix excessive allocations in EmbeddedResourceFileLoader #3242

Job	Run time
Build all projects without errors	10m 55s
Build published projects without warnings (Release)	2m 32s
JS unit tests	1m 1s
.NET unit tests (ubuntu-latest)	2m 40s
Build published projects without warnings (Debug)	2m 38s
UI tests (chrome, ubuntu-latest, Production, Default)	14m 56s
.NET unit tests (windows-2022)	10m 42s
UI tests (chrome, windows-2022, Development, Default)	28m 9s
UI tests (firefox, ubuntu-latest, Development, Default)	19m 45s
.NET unit tests (macOS-latest)	3m 29s
UI tests (firefox, ubuntu-latest, Production, Default)	18m 38s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	20m 32s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	16m 4s
	2h 32m 1s

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