Use JDK_IMPL_BASE to distinguish implementation

[joeyleeeeeee97]

Use base JDK implementation to trigger tests.
Issue: #2041

[smlambert]

Related: adoptium/TKG#115 - there is a consideration to introduce JDK_VENDOR so as to not convolute JDK_IMPL (which was originally intended to be VM implementation, which would ultimately get used in this template.

We need not delay this change, but rather revisit the template after a change for TKG 115 is in.

[karianna]

Related: AdoptOpenJDK/TKG#115 - there is a consideration to introduce JDK_VENDOR so as to not convolute JDK_IMPL (which was originally intended to be VM implementation, which would ultimately get used in this template.

We need not delay this change, but rather revisit the template after a change for TKG 115 is in.

Agreed I'd rather that we use Vendor - but we need to do a pretty major refactor across build, test, API and website for this

[llxia]

LGTM

[llxia]

Tested in internal Test_Job_Auto_Gen_Sandbox (61 and 62) as the script needs Admin approval for running at Adopt Jenkins.

[llxia]

@ShelleyLambert I will leave it to you to merge because this script needs to be approved in Adopt Jenkins. Thanks