fix(ui): DeleteModal and MCP details view changes

[YuliaKrimerman]

Description

DeleteModal.tsx

• Added an optional confirmationRequiredIndicator prop (defaults to false) that appends a required indicator (*) after the confirmation prompt text when enabled. This supports downstream consumers (e.g., MCP deployment deletion) that need to visually mark the confirmation field as required.
• Added data-testid="delete-modal-confirm-button" on the danger/confirm Button to improve testability — downstream Cypress tests target this selector.

McpServerDetailsView.tsx:

• Fixed microcopy: changed "Source Code" → "Source code" in the DescriptionListTerm to follow sentence-case convention consistent with other labels on the page (e.g., "Deployment mode", "Transport type").

How Has This Been Tested?

• Manual code review confirmed backward compatibility (optional prop with default, additive test ID).

Merge criteria:

• All the commits have been signed-off (To pass the DCO check)

• The commits have meaningful messages

• Automated tests are provided as part of the PR for major new functionalities; testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).

• The developer has manually tested the changes and verified that the changes work.

• Code changes follow the kubeflow contribution guidelines.

• For first time contributors: Please reach out to the Reviewers to ensure all tests are being run, ensuring the label ok-to-test has been added to the PR.

If you have UI changes

• The developer has added tests or explained why testing cannot be added.
• Included any necessary screenshots or gifs if it was a UI change.
• Verify that UI/UX changes conform the UX guidelines for Kubeflow.

[manaswinidas]

Screenshots please

[manaswinidas]

/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: manaswinidas

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