Add Base - Level Reporting - Requirement 4

[beichen1024]

issue: https://formbio.atlassian.net/browse/PRO-959

test run: https://app.formbio.com/organizations/formbio/projects/utsw_benchvalidation/workflow-runs/c1124e3b-d501-44ab-b185-5fdc0c4c92f9/?panel=&previousPageParams=%7B%22orgId%22%3A%22formbio%22%2C%22pid%22%3A%22utsw_benchvalidation%22%2C%22panel%22%3A%22%22%2C%22status%22%3A%22%22%2C%22users%22%3A%22%22%7D&selectedFile=&supportFile=&tab=Results

tsv column updated

report stays unchanged

[Copilot]

Pull Request Overview

This PR adds a "base" column to various aggregation tables and reports, which contains the sum of mapped lengths for alignment data. The change enhances the reporting functionality by providing both count and length-based metrics.

• Adds base column calculation using pre-aggregated alignment data
• Updates R Markdown report to display the new base counts in tables
• Modifies flip-flop aggregation to include length summation alongside counts

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/aggregate_tables.py	Adds base column calculation by merging alignment length data and updating aggregation functions
src/report.Rmd	Updates table headers and column selections to include the new "Base Counts" column

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