TF-11505 Add description to project resource

[netramali]

Description

Description was added as an attribute to the project's api and hence changes need to be reflected here on projects resource.

Testing plan

Integration Tests

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.

=== RUN   TestProjectsCreate
--- PASS: TestProjectsCreate (2.24s)
=== RUN   TestProjectsCreate/with_valid_options
    --- PASS: TestProjectsCreate/with_valid_options (0.57s)
=== RUN   TestProjectsCreate/when_options_is_missing_name
    --- PASS: TestProjectsCreate/when_options_is_missing_name (0.00s)
=== RUN   TestProjectsCreate/when_options_has_an_invalid_name
    --- PASS: TestProjectsCreate/when_options_has_an_invalid_name (0.23s)
=== RUN   TestProjectsCreate/when_options_has_an_invalid_organization
    --- PASS: TestProjectsCreate/when_options_has_an_invalid_organization (0.00s)
PASS

=== RUN   TestProjectsUpdate
--- PASS: TestProjectsUpdate (2.80s)
=== RUN   TestProjectsUpdate/with_valid_options
    --- PASS: TestProjectsUpdate/with_valid_options (0.56s)
=== RUN   TestProjectsUpdate/when_updating_with_invalid_name
    --- PASS: TestProjectsUpdate/when_updating_with_invalid_name (0.51s)
=== RUN   TestProjectsUpdate/without_a_valid_projects_ID
    --- PASS: TestProjectsUpdate/without_a_valid_projects_ID (0.00s)
PASS

[uturunku1]

Related changes:
https://github.com/hashicorp/atlas/pull/18568 and https://github.com/hashicorp/atlas/pull/18494

[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.