Add masked_and_hidden field to project variable create and get api

[yogeshlonkar]

No description provided.

[timofurrer]

@yogeshlonkar thanks for the contribution 🤝 I've left some clarification questions on the correctness of the field / field naming. Back to you 🏓

[RicePatrick]

I went ahead and tested this against a locally running GitLab with the 2 suggested changes, and the tests pass. If you'd please make those changes, I'm good to merge.

[RicePatrick]

Suggested change

	MaskedAndHidden bool `json:"masked_and_hidden"`
	Masked bool `json:"masked"`

When reading the variable, you get the masked result back, not masked_and_hidden - Masked and Hidden have a value of true for this.

[RicePatrick]

Suggested change

	MaskedAndHidden *bool `url:"masked_and_hidden,omitempty" json:"masked,omitempty"`
	MaskedAndHidden *bool `url:"masked_and_hidden,omitempty" json:"masked_and_hidden,omitempty"`

Similarly when creating the variable, we need to pass in masked_and_hidden whether we're using the URL or the JSON, so this value needs to be updated.

[RicePatrick]

Here is the test I used to test the above 2 suggestions:

func TestProjectVariablesService_MaskAndHidden_RealGitLab(t *testing.T) {
	client, err := NewClient("<token>",
		WithBaseURL("http://localhost:8085"),
	)
	if err != nil {
		t.Fatalf("Failed to create client: %v", err)
	}
	// create a project
	project, _, err := client.Projects.CreateProject(&CreateProjectOptions{
		Name: Ptr(fmt.Sprintf("test-%d", time.Now().UnixMicro())),
	})
	if err != nil {
		t.Fatalf("Failed to create project: %v", err)
	}
	projectVar, _, err := client.ProjectVariables.CreateVariable(project.ID, &CreateProjectVariableOptions{
		Key:             Ptr("test"),
		Value:           Ptr("testtesttest"), // must have a min of 8 characters
		MaskedAndHidden: Ptr(true),
	})
	if err != nil {
		t.Fatalf("Failed to create project variable: %v", err)
	}

	assert.True(t, projectVar.Hidden)
}