add exclude tags to workspace list options

[Uk1288]

Description

Currently the list of Workspaces within an Organization can be filtered with Tags string to include. This PR adds the ability to exclude workspaces by tags using the ExcludeTags option.

For example, given workspace1 with tag one and workspace2 with tag two, invoking

client.Workspaces.List(ctx, orgName, &WorkspaceListOptions{
			ExcludeTags: "two",
		})

should only return workspace1.

Testing plan

• Create an organization
• Create workspaces with tags in that organization
• List workspaces using the ExcludeTags options, should list all workspaces excluding ones with the excluded tags.

External links

Output from tests

Including output from tests may require access to a TFE instance. Ignore this section if you have no environment to test against.

$ TFE_ADDRESS="https://example" TFE_TOKEN="example" TF_ACC="1" go test ./... -v -tags=integration -run TestWorkspacesList

=== RUN   TestWorkspacesList
=== RUN   TestWorkspacesList/without_list_options
=== RUN   TestWorkspacesList/with_list_options
=== RUN   TestWorkspacesList/when_searching_a_known_workspace
=== RUN   TestWorkspacesList/when_searching_using_a_tag
=== RUN   TestWorkspacesList/when_searching_using_exclude-tags
=== RUN   TestWorkspacesList/when_searching_an_unknown_workspace
=== RUN   TestWorkspacesList/without_a_valid_organization
=== RUN   TestWorkspacesList/with_organization_included
=== RUN   TestWorkspacesList/with_current-state-version,current-run_included
--- PASS: TestWorkspacesList (80.58s)
    --- PASS: TestWorkspacesList/without_list_options (0.29s)
    --- PASS: TestWorkspacesList/with_list_options (0.22s)
    --- PASS: TestWorkspacesList/when_searching_a_known_workspace (0.25s)
    --- PASS: TestWorkspacesList/when_searching_using_a_tag (0.55s)
    --- PASS: TestWorkspacesList/when_searching_using_exclude-tags (0.70s)
    --- PASS: TestWorkspacesList/when_searching_an_unknown_workspace (0.23s)
    --- PASS: TestWorkspacesList/without_a_valid_organization (0.00s)
    --- PASS: TestWorkspacesList/with_organization_included (0.33s)
    --- PASS: TestWorkspacesList/with_current-state-version,current-run_included (75.02s)
PASS

[annawinkler]

🌟 Thanks for opening this PR! It looks like you need to complete the contributor agreement for this repo. I took a quick look at the test failures, and one might be failing because of this change. Maybe take a look?

[sebasslash]

Tests are failing since it's not available in tflocal yet. Code changes look good to me 🔥

[brandonc]

👍 once API & docs are merged

[sebasslash]

Woohoo! 🔥

[github-actions]

Reminder to the contributor that merged this PR: if your changes have added important functionality or fixed a relevant bug, open a follow-up PR to update CHANGELOG.md with a note on your changes.