Remove UrlBlob and all related code

[iaroslav-ciupin]

Tracking issue

https://github.com/flyteorg/flyte/issues/

Why are the changes needed?

What changes were proposed in this pull request?

How was this patch tested?

Setup process

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Check all the applicable boxes

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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.77%. Comparing base (2adaf61) to head (98c9f77).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5005      +/-   ##
==========================================
+ Coverage   58.97%   59.77%   +0.79%     
==========================================
  Files         645      463     -182     
  Lines       55562    37635   -17927     
==========================================
- Hits        32768    22495   -10273     
+ Misses      20199    13447    -6752     
+ Partials     2595     1693     -902     

Flag	Coverage Δ
unittests	59.77% <ø> (+0.79%)	⬆️

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[katrogan]

this is great, confirmed with the UI team that they aren't reading the deprecated fields

can you run through a few exercises to verify this doesn't break anything? you should be able to test this locally using the flyte sandbox (https://docs.flyte.org/en/latest/community/contribute.html#how-to-setup-dev-environment-for-flyteidl-flyteadmin-flyteplugins-flytepropeller-datacatalog-and-flytestdlib)

1. verify that recovery works for an execution with multiple nodes (can abort the first attempt mid-way through, after one at least one node succeeds)
2. verify flytekit remote access works (https://docs.flyte.org/en/latest/api/flytekit/remote.html#remote-access) - i believe it should based on this fallback: https://github.com/flyteorg/flytekit/blob/1c0b22813ec91625a597a4248f4b547d7c62c52b/flytekit/remote/remote.py#L1915-L1939