feat: add JFROG_CLI_CERTS_DIR env support

[andreasvikke]

• All tests passed. If this feature is not already covered by the tests, I added new tests.
• All static analysis checks passed.
• This pull request is on the master branch.
• I used gofmt for formatting the code before submitting the pull request.

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This PR introduces the env variable JFROG_CLI_CERTS_DIR for overriding the certificates directory.
More information about the feature can be found here jfrog/jfrog-cli#3661

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[fluxxBot]

also please raise a PR on jfrog-cli - https://github.com/jfrog/jfrog-cli with a integration test

[fluxxBot]

also tests are failing please take a look

[andreasvikke]

@fluxxBot

I have implemented some changes based on your review, and i should have fixed the test failing on Windows.
Please also see the integration test implementation at jfrog/jfrog-cli#3683

[fluxxBot]

@andreasvikke please check this replace directive here - https://github.com/jfrog/jfrog-cli/pull/3683/changes#diff-33ef32bf6c23acb95f5902d7097b7a1d5128ca061167ec0716715b0b9eeaa5f6R253
please replace it with the commit associated with this PR

[andreasvikke]

@andreasvikke please check this replace directive here - https://github.com/jfrog/jfrog-cli/pull/3683/changes#diff-33ef32bf6c23acb95f5902d7097b7a1d5128ca061167ec0716715b0b9eeaa5f6R253 please replace it with the commit associated with this PR

Ofc. i have now made the replace, so it point at the head commit of this PR.
Im not able to point it to github.com/jfrog/jfrog-cli-core... as the commit is non existing until merge.
Therefore i pointed it at my Fork.