fix: Small codegen libraries were removed from the Project Structure

[tpasternak]

Partially related to #6547

The EmptyJarFilter is using a heuristic that is really not robust

intellij/java/src/com/google/idea/blaze/java/sync/importer/emptylibrary/EmptyLibraryFilter.java

Lines 42 to 50 in 3f81565

	* Any JAR that is this size (in bytes) or smaller is assumed to be empty.
	*
	* <p>We came up with this number by checking the file size and contents for every JAR in the
	* .blaze/libraries directory for several projects (AGSA, AGMM, Express, Photos, Phonesky,
	* Memegen, and ASwB). This is the size of the largest empty JAR we saw that is still smaller than
	* all of the non-empty JARs we saw.
	*/
	private static final IntExperiment presumedEmptyThresholdBytes =
	new IntExperiment("blaze.empty.jar.threshold", 359);

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[tpasternak]

I already left the bazel org, can you please merge?