CI scripts: remove pip.conf migration code #2345

Job	Run time
check-lean-ci	43m 48s
checks / check-style	1s
changed-files / Check changed files	39m 1s
checks / other-checks	41m 15s
prevent-merge-with-lean-ci	0s
compute-matrix-filters	0s
wheel-build-cuopt-mps-parser	0s
wheel-build-cuopt-sh-client	0s
wheel-build-cuopt-server	0s
conda-cpp-build	0s
wheel-build-libcuopt	0s
conda-cpp-tests	0s
conda-python-build	0s
docs-build	0s
conda-python-tests	0s
wheel-build-cuopt	0s
wheel-tests-cuopt-server	0s
wheel-tests-cuopt	0s
test-self-hosted-server	0s
pr-builder	0s
	2h 4m 5s

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