[chore][ping code owners] Fix multiple matching components

[crobert-1]

Description

The current awk expression will return all matches, so if a component label is a substring of another component label, the resulting label will be all matching labels appended to each other.

Example: #38780
The label wasn't originally added because the found label was too long to add. However, code owners were properly pinged. When I added the proper label, the incorrect label name was detected.

When searching the .github/component_labels.txt file, the label we want to add is the first match that we find. This is the minimally matching label, since the file is in alphabetical order. There may be a better awk way to implement this logic, but head -n 1 returns the first matching line, if any are found in the given text.

Link to tracking issue

Related #38622

Testing

Before:

crobert$ ~/dev/contrib/first $ COMPONENT="receiver/hostmetrics"
crobert$ ~/dev/contrib/first $ awk -v path="${COMPONENT}" 'index($1, path) > 0 || index($2, path) > 0 {print $1}' .github/component_labels.txt
receiver/hostmetricsreceiver
receiver/hostmetricsreceiver/internal/scraper/cpuscraper
receiver/hostmetricsreceiver/internal/scraper/diskscraper
receiver/hostmetricsreceiver/internal/scraper/filesystemscraper
receiver/hostmetricsreceiver/internal/scraper/loadscraper
receiver/hostmetricsreceiver/internal/scraper/memoryscraper
receiver/hostmetricsreceiver/internal/scraper/networkscraper
receiver/hostmetricsreceiver/internal/scraper/pagingscraper
receiver/hostmetricsreceiver/internal/scraper/processesscraper
receiver/hostmetricsreceiver/internal/scraper/processscraper
receiver/hostmetricsreceiver/internal/scraper/systemscraper
crobert$ ~/dev/contrib/first $ COMPONENT="extension/encoding"
crobert$ ~/dev/contrib/first $ awk -v path="${COMPONENT}" 'index($1, path) > 0 || index($2, path) > 0 {print $1}' .github/component_labels.txt
extension/encoding
extension/encoding/avrologencodingextension
extension/encoding/awscloudwatchmetricstreamsencodingextension
extension/encoding/awslogsencodingextension
extension/encoding/googlecloudlogentryencodingextension
extension/encoding/jaegerencodingextension
extension/encoding/jsonlogencodingextension
extension/encoding/otlpencodingextension
extension/encoding/skywalkingencodingextension
extension/encoding/textencodingextension
extension/encoding/zipkinencodingextension

After:

crobert$ ~/dev/contrib/first $ COMPONENT="receiver/hostmetrics"
crobert$ ~/dev/contrib/first $ awk -v path="${COMPONENT}" 'index($1, path) > 0 || index($2, path) > 0 {print $1}' .github/component_labels.txt | head -n 1
receiver/hostmetricsreceiver
crobert$ ~/dev/contrib/first $ COMPONENT="extension/encoding"
crobert$ ~/dev/contrib/first $ awk -v path="${COMPONENT}" 'index($1, path) > 0 || index($2, path) > 0 {print $1}' .github/component_labels.txt | head -n 1
extension/encoding