[LSP] Add variable symbol gathering to symbol filler #3917

Job	Run time
KytheXrefs	0s
ClangTidy	8m 32s
KytheVerification	11m 25s
x86_64 test	10m 6s
arm64 test	18m 46s
x86_64 test-nortti	8m 11s
x86_64 test-c++20	7m 11s
x86_64 test-c++23	12m 7s
x86_64 smoke-test	14m 7s
arm64 smoke-test	19m 41s
x86_64 smoke-test-analyzer	20m 48s
arm64 smoke-test-analyzer	19m 56s
x86_64 asan	5m 50s
x86_64 asan-clang	8m 58s
x86_64 compile	8m 23s
arm64 compile	10m 8s
x86_64 compile-clang	7m 36s
arm64 compile-clang	9m 50s
x86_64 compile-static	4m 36s
arm64 compile-static	18m 17s
x86_64 compile-static-clang	11m 0s
arm64 compile-static-clang	13m 34s
x86_64 coverage	21m 32s
x86_64 clean	13m 15s
arm64 clean	14m 7s
MacOsBuildDevTools	23m 28s
Generate Build matrix	4s
MacOsBuild	47m 44s
PrepareVSPlugin	3m 7s
VerifyFormatting	1m 59s
WindowsBuild	9m 37s
Build ·${{ matrix.arch }}:${{ matrix.os }}:${{ matrix.ver }}${{ (((matrix.link == 'static') && ':static') \|\| '') }}	0s
Build and deploy GitHub pages	13s
📦 Release	0s
	6h 24m 8s

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