[ruby/openssl] Use ENV["TEST_RUBY_OPENSSL_FIPS_ENABLED"] instead of OpenSSL::OPENSSL_FIPS.

As OpenSSL::OPENSSL_FIPS always returns true on OpenSSL >= 3.0.0, we cannot use
this constant as a flag to check whether the OpenSSL is FIPS or not.
See <https://github.com/ruby/openssl/blob/d725783c5c180337f3d00efcba5b8744e0aea813/ext/openssl/ossl.c#L994-L1004>.

Skip the test_fips_mode_get_with_fips_mode_set test in AWS-LC case.

Because we don't test `OpenSSL.fips_mode=` on AWS-LC for now. We cannot change
the value of the `OpenSSL.fips_mode` on AWS-LC.
The `OpenSSL.fips_mode` in AWS-LC behaves as follows.

On AWS-LC non-FIPS:
```
$ bundle exec ruby -I ./lib -ropenssl.so -e 'p OpenSSL.fips_mode'
false

$ bundle exec ruby -I ./lib -ropenssl.so -e 'OpenSSL.fips_mode = true; p OpenSSL.fips_mode'
-e:1:in 'OpenSSL.fips_mode=': Turning on FIPS mode failed (OpenSSL::OpenSSLError)
	from -e:1:in '<main>'

$ bundle exec ruby -I ./lib -ropenssl.so -e 'OpenSSL.fips_mode = false; p OpenSSL.fips_mode'
false
```

On AWS-LC FIPS:
```
$ bundle exec ruby -I ./lib -ropenssl.so -e 'p OpenSSL.fips_mode'
true

$ bundle exec ruby -I ./lib -ropenssl.so -e 'OpenSSL.fips_mode = false; p OpenSSL.fips_mode'
-e:1:in 'OpenSSL.fips_mode=': Turning off FIPS mode failed (OpenSSL::OpenSSLError)
	from -e:1:in '<main>'

$ bundle exec ruby -I ./lib -ropenssl.so -e 'OpenSSL.fips_mode = true; p OpenSSL.fips_mode'
true
```

https://github.com/ruby/openssl/commit/fd3e3e722f

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