refactor: DBTP-1678 maintenance page refactor

[a-gleeson]

Addresses DBTP-1678

---

What

The maintenance page still used patches so the domain level was refactored to inject dependencies.
The application gracefully exits when a user says no to confirm prompts
Slightly imporved coverage.
Tests moved from legacy enivornment command.

---

Checklist:

Title:

• Scope included as per conventional commits
• Ticket reference included (unless it's a quick out of ticket thing)

Description:

• Link to ticket included (unless it's a quick out of ticket thing)
• Includes tests (or an explanation for why it doesn't)
• If the work includes user interface changes, before and after screenshots included in description
• Includes any applicable changes to the documentation in this code base
• Includes link(s) to any applicable changes to the documentation in the DBT Platform Documentation (can be to a pull request)

Tasks:

• Run the end to end tests for this branch and confirm that they are passing

[codecov-commenter]

❌ 3 Tests Failed:

Tests completed	Failed	Passed	Skipped
643	3	640	3

View the top 3 failed tests by shortest run time

tests/platform_helper/domain/test_database_copy.py::test_copy_command[services1-default]

Stack Traces | 0.01s run time

.../platform_helper/domain/test_database_copy.py:377: in test_copy_command
    mocks.maintenance_page_provider.activate.assert_called_once_with(
.../hostedtoolcache/Python/3.10.16.../x64/lib/python3.10/unittest/mock.py:940: in assert_called_once_with
    raise AssertionError(msg)
E   AssertionError: Expected 'activate' to be called once. Called 0 times.

tests/platform_helper/domain/test_database_copy.py::test_copy_command[services2-migrations]

Stack Traces | 0.01s run time

.../platform_helper/domain/test_database_copy.py:377: in test_copy_command
    mocks.maintenance_page_provider.activate.assert_called_once_with(
.../hostedtoolcache/Python/3.10.16.../x64/lib/python3.10/unittest/mock.py:940: in assert_called_once_with
    raise AssertionError(msg)
E   AssertionError: Expected 'activate' to be called once. Called 0 times.

tests/platform_helper/domain/test_database_copy.py::test_copy_command[services0-default]

Stack Traces | 0.011s run time

.../platform_helper/domain/test_database_copy.py:377: in test_copy_command
    mocks.maintenance_page_provider.activate.assert_called_once_with(
.../hostedtoolcache/Python/3.10.16.../x64/lib/python3.10/unittest/mock.py:940: in assert_called_once_with
    raise AssertionError(msg)
E   AssertionError: Expected 'activate' to be called once. Called 0 times.

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