Missing / non-conforming OGC API - Processes links/relations

[jerstlouis]

Description
Issues conforming with OGC API - Processes 1.0 discovered in extended T-17 TIEs:

• Each process description (/processes/{processId}) needs to include a link to the execution end-point with relation type http://www.opengis.net/def/rel/ogc/1.0/execute
• The list of processes (/processes) needs to include a link with relation type self in each array item pointing to the process description (/processes/{processId})
• Note also that the links currently in process description using collection relation type end-point linking to jobs is not correct -- the specification specifies http://www.opengis.net/def/rel/ogc/1.0/job-list to link to the list of jobs. (also applies to the content at /processes)
• The use of rel: canonical is probably also wrong, IANA says canonical "Designates the preferred version of a resource (the IRI and its contents).", and I would take this to mean the canonical resource for the same resource, not some other resource (also applies to the content at /processes)

Steps to Reproduce
Inspect the resources for an OGC API - Processes deployment of pygeoapi.

Expected behavior
Following the specifications as explained above.

Environment

• pygeoapi version: 0.12.dev0

Additional context
Testbed 17 / 52 North pygeoapi deployment - Ecere client TIEs

cc @MartinPontius @tomkralidis

[tomkralidis]

Thanks @jerstlouis for the detailed report. PR in #846

[tomkralidis]

Merged in #846. Please reopen if there are outstanding issues.