drop support for ols ramp fitting #4488

Job	Run time
check / Load tox environments	7s
latest_crds_contexts / retrieve latest CRDS contexts	3s
webbpsf_data_cache / retrieve latest WebbPSF data cache key	3s
crds_context	1s
check / check-dependencies (ubuntu-latest)	1m 5s
test / Load tox environments	3s
test / py310-oldestdeps-webbpsf-cov (ubuntu-latest)	28m 48s
test / py310-webbpsf-nolegacypath (ubuntu-latest)	26m 33s
test / py311-ddtrace-webbpsf (ubuntu-latest)	24m 52s
test / py311-ddtrace-webbpsf (macos-latest)	17m 3s
test / py311-webbpsf-cov (ubuntu-latest)	27m 20s
test / py312-webbpsf (ubuntu-latest)	25m 33s
	2h 31m 31s

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