added testing line for CNCF, crosslinked CNCF COC.

[sarhiri]

What type of PR is this?

CNCF incubation housekeeping task.

What this PR does / why we need it

• Adds a Testing section to CONTRIBUTING.md documenting that all new functionality must include tests and that CI runs the test suite automatically on every PR
• Adds a Code of Conduct cross-link to CONTRIBUTING.md pointing to CNCF Code of Conduct as per CNCF Incubation requirements

Which issue(s) this PR fixes

Fixes # N/A

Special notes for your reviewer

[greptile-apps]

Greptile Summary

This PR adds two housekeeping documentation changes required for CNCF incubation: a cross-link to the CNCF Code of Conduct in CODE_OF_CONDUCT.md, and two new sections in CONTRIBUTING.md covering testing expectations and a Code of Conduct reference.

• CODE_OF_CONDUCT.md: Inserts a single sentence at line 9 declaring that Armada adheres to the CNCF Code of Conduct, with a link to https://github.com/cncf/foundation/blob/main/code-of-conduct.md.
• CONTRIBUTING.md — Testing section: Documents that all new functionality must include tests and that CI runs them automatically on every PR.
• CONTRIBUTING.md — Code of Conduct section: Adds a top-level section (after Security, before License) linking readers to the project's CODE_OF_CONDUCT.md.

Confidence Score: 5/5

Documentation-only change with no code or configuration impact; safe to merge.

Both files receive small, self-contained additions — a reference sentence in CODE_OF_CONDUCT.md and two new sections in CONTRIBUTING.md. All links point to valid, stable URLs. No logic, configuration, or behaviour is touched.

No files require special attention.

Important Files Changed

Filename	Overview
CODE_OF_CONDUCT.md	Adds a single sentence (line 9) referencing the CNCF Code of Conduct with a valid GitHub link, placed appropriately before the existing sections.
CONTRIBUTING.md	Adds a Testing subsection under Contributing Guide and a top-level Code of Conduct section linking to the project's CODE_OF_CONDUCT.md; both additions are correct and well-placed.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[CONTRIBUTING.md] -->|links to| B[CODE_OF_CONDUCT.md]
    B -->|adheres to| C[CNCF Code of Conduct\ngithub.com/cncf/foundation]
    A -->|Testing section| D[CI runs full test suite\non every PR]
    A -->|Code of Conduct section| B

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