Add file output and multiple format support to image-updater

[hbhushan3]

Add file output and multiple format support to image-updater

https://issues.redhat.com/browse/AROSLSRE-237

Summary

Adds --output-file and --output-format flags to the image-updater tool, enabling results to be written to files in multiple formats (table, markdown, JSON) instead of only to stdout.

Changes

New Features

• --output-file flag: Specify a file path to write results instead of stdout
• --output-format flag: Choose output format - table (default), markdown, or json
• Production-grade table rendering: Integrated github.com/jedib0t/go-pretty/v6 library for professional ASCII and markdown tables

Usage Examples

# Default: table format to stdout
./image-updater update --config config.yaml --components acm-mce

# Write markdown to file
./image-updater update --config config.yaml --components acm-mce \
  --output-file results.md --output-format markdown

# Write JSON for automation
./image-updater update --config config.yaml --dry-run \
  --output-file preview.json --output-format json

# Preview changes in markdown
./image-updater update --config config.yaml --dry-run --output-format markdown

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: hbhushan3
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[hbhushan3]

#3577 finally merged :)

[openshift-ci]

@hbhushan3: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/baseimage-generator-images	2cd4802	link	true	/test baseimage-generator-images

Full PR test history. Your PR dashboard.

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