test_provider.rb: Make a legacy provider test optional. #406

Job	Run time
openssl-1.0.2u	53s
openssl-1.1.0l	50s
ruby-versions / Generate Ruby versions	3s
openssl-1.1.1w	59s
openssl-3.0.15	1m 0s
openssl-3.1.7	56s
openssl-3.2.3	57s
openssl-3.3.2	1m 0s
openssl-3.4.0	55s
openssl-master	3m 45s
libressl-3.1.5	58s
libressl-3.2.7	1m 1s
libressl-3.3.6	56s
libressl-3.4.3	57s
libressl-3.5.3	57s
libressl-3.6.3	1m 3s
libressl-3.7.3	59s
libressl-3.8.4	55s
libressl-3.9.2	58s
libressl-4.0.0	59s
openssl-3.0.15 with fips provider	37s
openssl-3.1.7 with fips provider	36s
openssl-3.2.3 with fips provider	43s
openssl-3.3.2 with fips provider	43s
openssl-3.4.0 without legacy provider	54s
ubuntu-22.04 2.7	1m 3s
ubuntu-22.04 3.0	56s
ubuntu-22.04 3.1	58s
ubuntu-22.04 3.2	56s
ubuntu-22.04 3.3	56s
ubuntu-22.04 head	54s
ubuntu-22.04 truffleruby	1m 30s
ubuntu-22.04 truffleruby-head	1m 36s
ubuntu-20.04 2.7	1m 6s
ubuntu-20.04 3.0	55s
ubuntu-20.04 3.1	56s
ubuntu-20.04 3.2	53s
ubuntu-20.04 3.3	58s
ubuntu-20.04 head	56s
ubuntu-20.04 truffleruby	1m 30s
ubuntu-20.04 truffleruby-head	1m 41s
macos-latest 2.7	57s
macos-latest 3.0	42s
macos-latest 3.1	44s
macos-latest 3.2	44s
macos-latest 3.3	51s
macos-latest head	45s
macos-latest truffleruby	1m 0s
macos-latest truffleruby-head	1m 18s
windows-latest 2.7	4m 18s
windows-latest 3.0	3m 57s
windows-latest 3.1	4m 21s
windows-latest 3.2	4m 6s
windows-latest 3.3	5m 53s
windows-latest head	4m 13s
windows-latest ucrt	3m 29s
windows-latest mswin	2m 23s
	1h 21m 59s

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