[BUG] - Make use of `dependencies.py`

[zdomke]

Describe the bug

The backend has a file containing all of the dependencies for our endpoints, but for some reason we aren't using the dependencies.

dependencies.py looks good and could be used, but instead we are making the services in each endpoint unnecessarily. Examples below:

react-squirrel-backend/app/api/v1/pvs.py

Line 22 in f47cd6e

service = PVService(db)

react-squirrel-backend/app/api/v1/snapshots.py

Line 75 in f47cd6e

service = SnapshotService(db, epics)

react-squirrel-backend/app/api/v1/tags.py

Line 72 in f47cd6e

service = TagService(db)

Expected behavior

All endpoints should make use of these dependencies instead of using the get_db dependency and creating the service themselves.

Steps to Reproduce

n/a

Possible solution (optional)

Old

react-squirrel-backend/app/api/v1/tags.py

Lines 38 to 45 in f47cd6e

	async def create_tag_group(data: TagGroupCreate, db: AsyncSession = Depends(get_db)):
	"""Create a new tag group."""
	service = TagService(db)
	try:
	group = await service.create_group(data)
	return success_response(group)
	except ValueError as e:
	raise APIException(409, str(e), 409)

New

async def create_tag_group(data: TagGroupCreate, service: TagService = Depends(get_tag_service)):
    """Create a new tag group."""
    try:
        group = await service.create_group(data)
        return success_response(group)
    except ValueError as e:
        raise APIException(409, str(e), 409)

My platform

No response

Additional context

No response