Promote the DockerfileComponentDetector to default

[jpinz]

No description provided.

[github-actions]

👋 Hi! It looks like you modified some files in the Detectors folder.
You may need to bump the detector versions if any of the following scenarios apply:

• The detector detects more or fewer components than before
• The detector generates different parent/child graph relationships than before
• The detector generates different devDependencies values than before

If none of the above scenarios apply, feel free to ignore this comment 🙂

[Copilot]

Pull request overview

This PR promotes the Dockerfile detector from experimental to a standard/default detector, meaning its results will now be included in scan outputs by default (without requiring an explicit --DetectorArgs ...=Enable opt-in).

Changes:

• Removed IExperimentalDetector from DockerfileComponentDetector, making it a non-experimental detector in orchestrator processing.
• Updated Dockerfile detector documentation to remove experimental/opt-in guidance.

Show a summary per file

File	Description
src/Microsoft.ComponentDetection.Detectors/dockerfile/DockerfileComponentDetector.cs	Drops the experimental marker interface so the orchestrator includes Dockerfile detector output by default.
docs/detectors/dockerfile.md	Removes experimental status and opt-in instructions/limitations now that the detector is promoted.

Copilot's findings

• Files reviewed: 2/2 changed files
• Comments generated: 0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.0%. Comparing base (f8c809e) to head (40cd60a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #1820   +/-   ##
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