Only enable Java dependency minimisation when caching is enabled #5028

Job	Run time
Diagnostic export (windows-latest, nightly-latest)	3m 26s
Diagnostic export (ubuntu-latest, linked)	1m 4s
Diagnostic export (windows-latest, linked)	1m 36s
Diagnostic export (macos-latest, nightly-latest)	1m 4s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 3s
Diagnostic export (macos-latest, linked)	1m 29s
	9m 42s

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