test_provider.rb: Make a legacy provider test optional. #1233

Job	Run time
openssl-1.0.2u	1m 2s
openssl-1.1.0l	52s
openssl-1.1.1w	52s
openssl-3.0.15	1m 4s
openssl-3.1.7	54s
openssl-3.2.3	1m 1s
openssl-3.3.2	1m 7s
openssl-3.4.0	1m 9s
openssl-master	3m 47s
libressl-3.1.5	55s
libressl-3.2.7	1m 1s
libressl-3.3.6	1m 2s
libressl-3.4.3	59s
libressl-3.5.3	1m 1s
libressl-3.6.3	1m 9s
libressl-3.7.3	56s
libressl-3.8.4	59s
libressl-3.9.2	59s
libressl-4.0.0	56s
openssl-3.0.15 with fips provider	53s
openssl-3.1.7 with fips provider	43s
openssl-3.2.3 with fips provider	36s
openssl-3.3.2 with fips provider	41s
openssl-3.4.0 without legacy provider	1m 15s
ruby-versions / Generate Ruby versions	3s
ubuntu-22.04 2.7	1m 5s
ubuntu-22.04 3.0	51s
ubuntu-22.04 3.1	1m 7s
ubuntu-22.04 3.2	1m 5s
ubuntu-22.04 3.3	59s
ubuntu-22.04 head	1m 15s
ubuntu-22.04 truffleruby	1m 38s
ubuntu-22.04 truffleruby-head	1m 48s
ubuntu-20.04 2.7	59s
ubuntu-20.04 3.0	1m 9s
ubuntu-20.04 3.1	1m 10s
ubuntu-20.04 3.2	59s
ubuntu-20.04 3.3	1m 1s
ubuntu-20.04 head	55s
ubuntu-20.04 truffleruby	1m 36s
ubuntu-20.04 truffleruby-head	1m 51s
macos-latest 2.7	55s
macos-latest 3.0	45s
macos-latest 3.1	48s
macos-latest 3.2	47s
macos-latest 3.3	44s
macos-latest head	44s
macos-latest truffleruby	1m 25s
macos-latest truffleruby-head	1m 19s
windows-latest 2.7	6m 29s
windows-latest 3.0	4m 25s
windows-latest 3.1	4m 42s
windows-latest 3.2	6m 54s
windows-latest 3.3	5m 38s
windows-latest head	4m 9s
windows-latest ucrt	5m 0s
windows-latest mswin	2m 57s
	1h 33m 5s

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