Update stderr redirections in scripts

[mrodm]

This PR updates the scripts or commands that redirect stderr to stdout.
For instance, this command does not redirect stderr to stdout as expected, it keeps showing the stderr:

 $ ls doesnotexist 2>&1 > /dev/null
ls: cannot access 'doesnotexist': No such file or directory

That command should be written as:

 $ ls doesnotexit > /dev/null 2>&1

[mrodm]

I think in these commands it is not needed to use 2>&1, since curl has the silent parameter (-s).

In case it is required, I think in one of these ways:

# redirect the stderr to stdout in the command before pipe
curl -s --cacert /usr/share/kibana/config/certs/ca-cert.pem -f https://localhost:5601/login 2>&1 | grep kbn-injected-metadata > /dev/null

# pipe both stdout and stderr to the stdin of the next command (same as before)
curl -s --cacert /usr/share/kibana/config/certs/ca-cert.pem -f https://localhost:5601/login |& grep kbn-injected-metadata > /dev/null

# using a subshell to run the command
(curl -s --cacert /usr/share/kibana/config/certs/ca-cert.pem -f https://localhost:5601/login | grep kbn-injected-metadata) > /dev/null 2>&1

[elasticmachine]

💛 Build succeeded, but was flaky

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• Commit: 19fc461

Failed CI Steps

• :go: Integration test: system

History

• 💔 Build #5911 failed d09d97e

cc @mrodm

[mrodm]

Avoid showing the stderr output like:

ls: cannot access 'build/elastic-stack-dump/check-httpjson_false_positive_asserts/logs/elastic-agent-internal/default/*': No such file or directory
upload_safe_logs: artifacts files not found, nothing will be archived

And instead show this message:

upload_safe_logs: artifacts files not found at build/elastic-stack-dump/check-httpjson_false_positive_asserts/logs/elastic-agent-internal/default/*, nothing will be archived