[BUGFIX] Fix missing executor type in differing fields check for SparkProvider

[zhilingc]

Description

Currently unable to update spark provider with generic spark executor due to differing config check missing SparkGeneric as one of its possible executor options. This PR hopefully fixes that issue.

Error thrown by client:

> featureform apply definitions.py --insecure
...
...
grpc._channel._InactiveRpcError: <_InactiveRpcError of RPC that terminated with:
 status = StatusCode.UNKNOWN
 details = "unknown executor type: SPARK"
 debug_error_string = "UNKNOWN:Error received from peer  {created_time:"2023-05-03T20:47:58.156508+08:00", grpc_status:2, grpc_message:"unknown executor type: SPARK"}"

Type of change

Does this correspond to an open issue?

Select type(s) of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist:

• I have performed a self-review of my code
• [NA] I have commented my code, particularly in hard-to-understand areas
• [NA] I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have fixed any merge conflicts

[codecov]

Codecov Report

Merging #789 (478a797) into main (6f7b498) will decrease coverage by 30.34%.
The diff coverage is 14.35%.

@@             Coverage Diff             @@
##             main     #789       +/-   ##
===========================================
- Coverage   59.71%   29.37%   -30.34%     
===========================================
  Files          63       66        +3     
  Lines       12408    12974      +566     
===========================================
- Hits         7409     3811     -3598     
- Misses       4232     8881     +4649     
+ Partials      767      282      -485     

Impacted Files	Coverage Δ
config/config.go	20.00% <0.00%> (-80.00%)	⬇️
coordinator/coordinator.go	0.87% <0.00%> (-41.93%)	⬇️
helpers/compression/compression.go	0.00% <0.00%> (ø)
kubernetes/kubernetes.go	0.00% <0.00%> (-20.68%)	⬇️
provider/bigquery.go	0.00% <0.00%> (-70.19%)	⬇️
provider/filestore.go	12.53% <0.00%> (-30.40%)	⬇️
provider/k8s.go	11.20% <ø> (-19.01%)	⬇️
provider/provider_config/spark_config.go	60.60% <ø> (+3.55%)	⬆️
provider/provider_type/provider_type.go	100.00% <ø> (ø)
provider/redshift.go	0.00% <ø> (-85.25%)	⬇️
... and 7 more

... and 31 files with indirect coverage changes

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