feat: Add batch size parameter to retire_certs_s3 for incremental processing

[ttak-apphelix]

Overview:

Adds an optional batch_size query parameter to the certificate S3 retirement endpoint so scheduled jobs can process certificates incrementally instead of draining the full queue in one call.

Changes:

• Parses batch_size from RetireCertificatesS3View query params and applies it as a queryset limit.
• Logs the effective batch size when retirement starts.
• Bumps package version to 7.5.0 and adds a changelog entry

Private JIRA ticket:

• https://2u-internal.atlassian.net/browse/BOMS-488

Related PR(private):

• feat: add batch size option to certificate retirement API call configuration#341
• feat: add DRY_RUN and BATCH_SIZE parameters to RetireCertificates job and check_retire_users script jenkins-job-dsl#1841
• https://github.com/edx/edx-internal/pull/14343

Merge checklist:
Check off if complete or not applicable:

• Version bumped
• Changelog record added
• Fixup commits are squashed away

[Copilot]

Pull request overview

Adds an optional batch_size query parameter to the certificate S3 retirement endpoint so scheduled jobs can process certificates incrementally instead of draining the full queue in one call.

Changes:

• Parses batch_size from RetireCertificatesS3View query params and applies it as a queryset limit.
• Logs the effective batch size when retirement starts.
• Bumps package version to 7.5.0 and adds a changelog entry.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
edx_arch_experiments/certificates/views.py	Adds batch-size handling to the certificate retirement endpoint.
edx_arch_experiments/__init__.py	Updates package version to 7.5.0.
CHANGELOG.rst	Documents the new batch_size query parameter.

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