Use an empty config file to produce docs

[eapolinario]

Tracking issue

NA

Why are the changes needed?

After #5972 we require a config file in order to run the docs subcommand in all components.

We use the docs subcommand to produce the rst files under the docs directory, e.g. https://github.com/flyteorg/flyte/blob/master/docs/deployment/configuration/generated/flyteadmin_config.rst.

What changes were proposed in this pull request?

This PR introduces an empty config file to be passed to each of the invocations of the components docs subcommands in https://github.com/flyteorg/flyte/blob/master/script/generate_config_docs.sh#L46-L49.

How was this patch tested?

Ran make release_automation locally and confirmed that the command succeeds and docs are generated.

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.09%. Comparing base (9dc21f4) to head (7df4eb7).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6092      +/-   ##
==========================================
- Coverage   37.10%   37.09%   -0.01%     
==========================================
  Files        1318     1318              
  Lines      132403   132403              
==========================================
- Hits        49122    49116       -6     
- Misses      79009    79015       +6     
  Partials     4272     4272              

Flag	Coverage Δ
unittests-datacatalog	51.58% <ø> (ø)
unittests-flyteadmin	54.07% <ø> (-0.03%)	⬇️
unittests-flytecopilot	30.99% <ø> (ø)
unittests-flytectl	62.29% <ø> (ø)
unittests-flyteidl	7.23% <ø> (ø)
unittests-flyteplugins	53.82% <ø> (ø)
unittests-flytepropeller	42.60% <ø> (ø)
unittests-flytestdlib	57.59% <ø> (ø)

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