fix(cli): infer logs page size from API response (#8002)

[alighazi288]

This PR implements the dynamic logs pagination logic requested in #8002

• Removes hard-coded LOGS_DEFAULT_PAGE_SIZE = 200 in flow-run logs CLI
• Dynamically discovers page size by passing limit=None on the first request
• Refactors --tail logic to buffer pages in TIMESTAMP_DESC order to avoid offset math errors
• Adds test to verify pagination respects custom PREFECT_SERVER_API_DEFAULT_LIMIT

Checklist

• This pull request closes Infer page size in prefect flow-run logs CLI #8002
• If this pull request adds new functionality, it includes unit tests that cover the changes
• If this pull request removes docs files, it includes redirect settings in mint.json.
• If this pull request adds functions or classes, it includes helpful docstrings.

[codspeed-hq]

Merging this PR will not alter performance

✅ 2 untouched benchmarks

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_{Comparing alighazi288:fix/issue-8002-logs-pagination (275ca0a) with main (efb35bf)}