Remove trailing whitespace from copilot-instructions.md

[Copilot]

Addressed code review feedback on PR #7559 to remove trailing whitespace from line 3 of .github/copilot-instructions.md.

Changes:

• Removed trailing space from the shell script pipefail guideline

The guideline now reads:

When shell scripts or bash scripts are created or modified, if they contain any use of the pipe (|) operator, they must also set the pipefail option (set -o pipefail). Remind the PR author if they have missed that.

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