[chore] fix broken pipe errors in CI pipeline

[mowies]

Fix intermittent CI failures caused by broken pipe in validate-components.sh

printf '%s\n' "$valid_components" | grep -qxF "$component" was intermittently failing under set -o pipefail. When grep -q finds a match it exits early, closing the pipe while printf is still writing — causing printf to receive SIGPIPE (exit 141). With pipefail, the pipeline returns 141 (non-zero), and the surrounding if ! negates it to true, incorrectly treating valid components as missing and failing the build.

Fixed by replacing the pipe with a here-string (<<< "$valid_components"), which passes the data directly to grep with no pipe involved.

Example failing runs:

• https://github.com/open-telemetry/opentelemetry-collector-releases/actions/runs/24708467235
• https://github.com/open-telemetry/opentelemetry-collector-releases/actions/runs/24699008332
• https://github.com/open-telemetry/opentelemetry-collector-releases/actions/runs/24698836287

This was implemented using Claude Code.

[mowies]

the fix from the last commit seems to work here as well 👍🏼
reverting, since it's content from a different PR

[douglascamata]

This intermittent failure has been bugs us since a long time. I'm more than happy if this solves the issue.