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

NA

[codecov-commenter]

Codecov Report

Merging #135 into master will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #135      +/-   ##
==========================================
- 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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