Support EDR single item locations for Starlette

[webb-ben]

Overview

Starlette improperly parses the request path when parsing EDR queries for locations/{location_id}, this PR fixes that behavior to correctly identify when there is a single location specified.

Related Issue / discussion

Additional information

Dependency policy (RFC2)

• I have ensured that this PR meets RFC2 requirements

Updates to public demo

• I have ensured that breaking changes to the pygeoapi master demo server have been addressed
  • https://github.com/geopython/demo.pygeoapi.io/blob/master/services/pygeoapi_master/local.config.yml

Contributions and licensing

(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pygeoapi. I confirm that my contributions to pygeoapi will be compatible with the pygeoapi license guidelines at the time of contribution
• I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines

[tomkralidis]

Suggest:

    if 'collection_id' in request.path_params:
        collection_id = request.path_params['collection_id']

    if 'instance_id' in request.path_params:
        instance_id = request.path_params['instance_id']

    if 'location_id' in request.path_paths:
        location_id = request.path_params['location_id']

    query_type = request["path"].split('/')[-1]

    return await execute_from_starlette(
        edr_api.get_collection_edr_query, request, collection_id,
        instance_id, location_id, query_type,
        skip_valid_check=True
    )