Add FlyteDirectory to file_types.rst template

[ppiegaze]

Tracking issue

https://linear.app/unionai/issue/DOC-480/fix-rendering-of-flytedirectory-api-doc-page-in-flyte-docs

Why are the changes needed?

FlyteDirectory API docs page is rendering incorrectly

What changes were proposed in this pull request?

Adding FlyteDirectory to the if then logic of the template that produces the rendered page

How was this patch tested?

Local build

Check all the applicable boxes

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

Related PRs

Equivalent in flytekit repo:
flyteorg/flytekit#2584

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.98%. Comparing base (c1563d7) to head (d203cf0).
Report is 116 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5564   +/-   ##
=======================================
  Coverage   60.98%   60.98%           
=======================================
  Files         796      796           
  Lines       51647    51647           
=======================================
  Hits        31497    31497           
  Misses      17250    17250           
  Partials     2900     2900           

Flag	Coverage Δ
unittests-datacatalog	69.31% <ø> (ø)
unittests-flyteadmin	58.73% <ø> (ø)
unittests-flytecopilot	17.79% <ø> (ø)
unittests-flytectl	67.44% <ø> (ø)
unittests-flyteidl	79.06% <ø> (ø)
unittests-flyteplugins	61.85% <ø> (ø)
unittests-flytepropeller	57.42% <ø> (ø)
unittests-flytestdlib	65.65% <ø> (ø)

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