refactor: use type mapping objects

[murdo-moj]

• Use FindMoJDataEntityMapper objects to translate from FMD to Datahub types and subtypes
• I chose instances of this class rather than an object to represent our entity types as there's no logic we need to group with the mappings. Also instantiating classes all over the code was messy.
• Add FindMoJDataEntityType Enum
• Remove EntityTypes
• Remove SearchClient.fmd_type_to_datahub_types_mapping
• The formation of entity_type_filters is now nicer.

Note subtype "Metric" is not included in any of our searches now

[MatMoore]

Nice, this looks like an improvement from what we had before. Just a couple of minor suggestions.

[hjribeiro-moj]

LGTM

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ NameError: name 'PublicationDatasetEntityMapping' is not defined /details/{result_type}/{urn} View Issue

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