bug; Queuing budget no longer exists. Quality of service is not yet integrated

[kumare3]

TL;DR

This fix removes access of queuing_budget in flytekit as this is not used and there has been refactoring that renders the current Interface incorrect. Problems,
queuing_budget renamed to queueing_budget
field 1 in WorkflowMetadata is now QualityOfService instead
queueing budget is part of the QOSSpec and is one of.
Usage for the users was still access to queueing budget

Problems:
Flytekit was still accessing workflowmetadata.queuing_budget and this breaks in production for anyone who upgrades to latest flytekit.

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

Currently eliminated queuing_budget as it is not used. It should be re-introduced carefully thinking about the interface

Tracking Issue

flyteorg/flyte#410

Follow-up issue

flyteorg/flyte#410

[codecov-commenter]

Codecov Report

Merging #133 into master will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #133      +/-   ##
==========================================
- Coverage   81.38%   81.35%   -0.04%     
==========================================
  Files         217      217              
  Lines       14153    14124      -29     
  Branches     1160     1158       -2     
==========================================
- Hits        11518    11490      -28     
+ Misses       2353     2352       -1     
  Partials      282      282              

Impacted Files	Coverage Δ
tests/flytekit/unit/sdk/test_workflow.py	96.66% <ø> (+0.54%)	⬆️
flytekit/__init__.py	100.00% <100.00%> (ø)
flytekit/common/workflow.py	74.85% <100.00%> (ø)
flytekit/models/core/workflow.py	100.00% <100.00%> (ø)
flytekit/sdk/workflow.py	100.00% <100.00%> (ø)
tests/flytekit/unit/models/core/test_workflow.py	100.00% <100.00%> (ø)

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