### Description

https://github.com/apache/airflow/pull/17946 implements a `/robots.txt` endpoint to block search engines crawling Airflow - in the cases where it is (accidentally) exposed to the public Internet.

If we record any GET requests to that end-point we'd have a strong warning flag that the deployment is exposed, and could issue a warning in the UI, or even enable some kill-switch on the deployment. 

Some deployments are likely intentionally available and rely on auth mechanisms on the `login` endpoint, so there should be a config option to suppress the warnings.

An alternative approach would be to monitor for requests from specific user-agents used by crawlers for the same reasons

### Use case/motivation

People who accidentally expose airflow have a slightly higher chance of realising they've done so and tighten their security.

### Related issues

_No response_

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

tests/www/views/test_views_base.py
resp = admin_client.post(url, follow_redirects=True)
    assert resp.status_code == 200
    if check_response:
        assert check_response(resp)
@pytest.mark.parametrize(
    "url, client, content, username",
    [
        ("resetmypassword/form", "viewer_client", "Password Changed", "test_viewer"),
        ("resetpassword/form?pk={}", "admin_client", "Password Changed", "test_admin"),
        ("resetpassword/form?pk={}", "viewer_client", "Access is Denied", "test_viewer"),
    ],
    ids=["my-viewer", "pk-admin", "pk-viewer"],
)
def test_resetmypasswordview_edit(app, request, url, client, content, username):
    user = app.appbuilder.sm.find_user(username)
    resp = request.getfixturevalue(client).post(
        url.format(user.id), data={'password': 'blah', 'conf_password': 'blah'}, follow_redirects=True
    )
    check_content_in_response(content, resp)
def test_resetmypasswordview_read(viewer_client):
    
    resp = viewer_client.get('resetmypassword/form', follow_redirects=True)
    check_content_in_response('Reset Password Form', resp)
def test_get_myuserinfo(admin_client):