Add Pipeline Upload filesize limit

[andrewballantyne]

https://issues.redhat.com/browse/RHOAIENG-4189

Description

If bytes exceed 1 megabyte, prevent it client side -- the default on the fastify server is 1 mb -- we may want to find a better way to configure this in the long run.

How Has This Been Tested?

Using Pipelines, upload a Pipeline & select a file larger than 1 megabyte (with a .yaml extenstion)

Test Impact

Tests added to verify the error shows when a too large of a file is uploaded.

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Commits have been squashed into descriptive, self-contained units of work (e.g. 'WIP' and 'Implements feedback' style messages have been removed)
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)

If you have UI changes:

• Included any necessary screenshots or gifs if it was a UI change.
• Included tags to the UX team if it was a UI/UX change (find relevant UX in the SMEs section).

After the PR is posted & before it merges:

• The developer has tested their solution on a cluster by using the image produced by the PR to main

cc @yannnz

[codecov]

Codecov Report

Attention: Patch coverage is 96.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.19%. Comparing base (20d32e9) to head (95b3410).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2874      +/-   ##
==========================================
+ Coverage   78.14%   78.19%   +0.04%     
==========================================
  Files        1101     1101              
  Lines       23421    23438      +17     
  Branches     5902     5907       +5     
==========================================
+ Hits        18303    18327      +24     
+ Misses       5118     5111       -7     

Files	Coverage Δ
...ts/pipelines/content/import/PipelineFileUpload.tsx	96.55% <96.00%> (+21.55%)	⬆️

... and 2 files with indirect coverage changes

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[jeff-phillips-18]

/lgtm

[openshift-ci]

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