login.gov for firewood

[mtlaney]

## Summary Addresses Issue Login.gov for firewood

Please note if fully resolves the issue per the acceptance criteria: Yes

This Pull request updates the firewood buy route to be protected by our access control service implementing login.gov. Locally it hits the mock auth route, we need to test in DEV for full login.gov implementation

Impacted Areas of the Site

• /firewood/forests/{{forest.forest.Abbr}}/buy

This pull request changes...

• [ ] Route protections on firewood

This pull request is ready to merge when...

• [ ] Feature branch is starts with the issue number
• [ ] Is connected to its original issue via zenhub 👇
• [ ] Tests have been updated
• [ ] All tests are passing and meet coverage, linting, and accessibility requirements. And no security vulnerabilities ⚫️(Jenkins)
• [ ] This code has been reviewed by someone other than the original author