PolynomialMatrixReconstruction: Change xLGraph to thread_local unique_ptr #12411

Job	Run time
detector-info	34s
env	2s
list-open-prs / list-open-prs	4s
build (clang++, Debug, nightly, -fprofile-instr-generate -fcoverage-mapping)	1s
build (clang++, Release, 25.05.0-stable)	1s
build (clang++, Release, nightly, OFF, ON)	1s
build (clang++, Release, ON, OFF, ON, nightly)	48s
build (g++, Release, ON, OFF, ON, nightly)	48s
build (clang++, Release, 25.01.1-stable)	48s
trigger-container	1s
llvm-cov	1s
clang-tidy-iwyu	1s
npsim-gun-EcalLumiSpec	1s
npsim-dis	1s
npsim-minbias	1s
npsim-gun	1s
eicrecon-gun-EcalLumiSpec	1s
eicrecon-test-plugins	1s
eicrecon-benchmarks-plugins	1s
eicrecon-gun	1s
eicrecon-dis	1s
compare-single-multi-threaded	1s
eicrecon-two-stage-running	1s
build-docs	1s
get-docs-from-open-prs	1s
get-docs-from-main	1s
collect-docs	1s
cancel-container	4s
deploy-docs	1s
	3m 30s

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