enable_fuzz_test_targets should default to false if chip_build_tests is false.

[bzbarsky-apple]

When enable_fuzz_test_targets is true, we end up pulling in things that assert chip_build_tests is true.

[github-actions]

PR #26067: Size comparison from 00e5976 to 89fe368

Decreases (1 build for cc32xx)

platform	target	config	section	00e5976	89fe368	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	20303347	20303346	-1	-0.0

Full report (1 build for cc32xx)

platform	target	config	section	00e5976	89fe368	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	642953	642953	0	0.0
			(read/write)	203848	203848	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197248	197248	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	933129	933129	0	0.0
			.debug_aranges	87616	87616	0	0.0
			.debug_frame	301352	301352	0	0.0
			.debug_info	20303347	20303346	-1	-0.0
			.debug_line	2679969	2679969	0	0.0
			.debug_loc	2824782	2824782	0	0.0
			.debug_ranges	286208	286208	0	0.0
			.debug_str	3039567	3039567	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104353	104353	0	0.0
			.shstrtab	232	232	0	0.0
			.stab	204	204	0	0.0
			.stabstr	441	441	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	377533	377533	0	0.0
			.symtab	256800	256800	0	0.0
			.text	536480	536480	0	0.0

[github-actions]

PR #26067: Size comparison from 2ce04b5 to 36dc086

Full report (3 builds for cc32xx, qpg)

platform	target	config	section	2ce04b5	36dc086	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	642953	642953	0	0.0
			(read/write)	203848	203848	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197248	197248	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	933129	933129	0	0.0
			.debug_aranges	87616	87616	0	0.0
			.debug_frame	301352	301352	0	0.0
			.debug_info	20303348	20303348	0	0.0
			.debug_line	2679969	2679969	0	0.0
			.debug_loc	2824782	2824782	0	0.0
			.debug_ranges	286208	286208	0	0.0
			.debug_str	3039567	3039567	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104353	104353	0	0.0
			.shstrtab	232	232	0	0.0
			.stab	204	204	0	0.0
			.stabstr	441	441	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	377533	377533	0	0.0
			.symtab	256800	256800	0	0.0
			.text	536480	536480	0	0.0
qpg	lighting-app	qpg6105+debug	(read/write)	1154764	1154764	0	0.0
			.bss	97404	97404	0	0.0
			.data	836	836	0	0.0
			.text	601860	601860	0	0.0
	lock-app	qpg6105+debug	(read/write)	1124844	1124844	0	0.0
			.bss	92548	92548	0	0.0
			.data	840	840	0	0.0
			.text	571944	571944	0	0.0