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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🐸 JFrog Frogbot

[fluxxBot]

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

[fluxxBot]

create a helper function that returns a defer function which unsets this

[andreasvikke]

I have created a defer func using the same method used further up the same file:

jfrog-cli-core/utils/coreutils/utils_test.go

Lines 221 to 223 in 77deb9f

	defer func() {
	assert.NoError(t, os.Unsetenv(test.remoteEnv))
	}()

[fluxxBot]

also need to normalize and validate the system paths

[andreasvikke]

I have added a filepath normalization to the certsDir, but validation doesn't seem to fit here.
We do not validate the JFrog Home Dir either

jfrog-cli-core/utils/coreutils/utils.go

Lines 310 to 313 in 77deb9f

	func GetJfrogHomeDir() (string, error) {
	if os.Getenv(HomeDir) != "" {
	return os.Getenv(HomeDir), nil
	}

Please tell me if i should add validation nonetheless

[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