feat: use jumpstart deployment config image as default optimization image

[gwang111]

Issue #, if available:

Description of changes:

• Fetch the image uri default for .optimize() from the JumpStart deployment config in vLLM usecases
• Update unit and integ tests to verify that the default is being propagated to .optimize()

Testing done:
Set

"ModelShardingConfig": {
    "Image": "dkr:jumpstart-deployment-config-image-uri"
}
or 
"ModelQuantizationConfig": {
    "Image": "dkr:jumpstart-deployment-config-image-uri"
}

In the following instances:

1. When the customer wants to quantize their model
2. When the customer wants to optimize with model sharding

Skip:

1. For speculative decoding, .optimize() does not need to be called. No defaulting
2. Skip configurations not supported by vLLM
3. Skip for compilation as vLLM does not support compilation

Merge Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your pull request.

General

• I have read the CONTRIBUTING doc
• I certify that the changes I am introducing will be backward compatible, and I have discussed concerns about this, if any, with the Python SDK team
• I used the commit message format described in CONTRIBUTING
• I have passed the region in to all S3 and STS clients that I've initialized as part of this change.
• I have updated any necessary documentation, including READMEs and API docs (if appropriate)

Tests

• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added unit and/or integration tests as appropriate to ensure backward compatibility of the changes
• I have checked that my tests are not configured for a specific region or account (if appropriate)
• I have used unique_name_from_base to create resource names in integ tests (if appropriate)
• If adding any dependency in requirements.txt files, I have spell checked and ensured they exist in PyPi

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Attention: Patch coverage is 94.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 86.56%. Comparing base (7e5e69b) to head (427108f).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/sagemaker/serve/builder/jumpstart_builder.py	94.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4992   +/-   ##
=======================================
  Coverage   86.55%   86.56%           
=======================================
  Files         438      438           
  Lines       42536    42584   +48     
=======================================
+ Hits        36817    36862   +45     
- Misses       5719     5722    +3     

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[gwang111]

Integ tests r failing due to botocore.errorfactory.ResourceLimitExceeded exceptions