remove STDIO from MCP Catalog source YAML sample

[Philip-Carneiro]

Description

just removal of STDIO from YAML sample file of MCP catalog settings

How Has This Been Tested?

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.
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If you have UI changes

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[Philip-Carneiro]

/retest

[Philip-Carneiro]

/retest

[mturley]

/lgtm
/approve

[manaswinidas]

/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: manaswinidas, mturley

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