[chore] remove deprecated LoadTLSConfigContext methods #20010

Job	Run time
govulncheck	32s
setup-environment	9s
checks	1m 49s
cross-build-collector (darwin, amd64)	39s
lint	3m 9s
cross-build-collector (darwin, arm64)	41s
test-coverage	5m 23s
cross-build-collector (linux, 386)	41s
unittest-matrix (ubuntu-latest, ~1.22)	2m 21s
cross-build-collector (linux, amd64)	48s
unittest-matrix (ubuntu-latest, ~1.21.10)	2m 21s
cross-build-collector (linux, arm64)	41s
cross-build-collector (linux, ppc64le)	37s
cross-build-collector (linux, arm, 7)	36s
cross-build-collector (linux, s390x)	36s
cross-build-collector (windows, 386)	35s
cross-build-collector (windows, amd64)	36s
unittest	1s
	22m 15s

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