Fix typo in the GPG FS verifier warn message

[pierrehilbert]

What does this PR do?

Replace succfailed by failed.

Why is it important?

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in ./changelog/fragments using the changelog tool
• I have added an integration test or an E2E test

Author's Checklist

• [ ]

How to test this PR locally

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• How are we going to support this in production?
• How are we going to measure its adoption?
• How are we going to debug this?
• What are the metrics I should take care of?
• ...

[elasticmachine]

Pinging @elastic/elastic-agent (Team:Elastic-Agent)

[mergify]

This pull request does not have a backport label. Could you fix it @pierrehilbert? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v./d./d./d is the label to automatically backport to the 8./d branch. /d is the digit

NOTE: backport-skip has been added to this pull request.

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-10-11T14:10:48.823+0000

• Duration: 30 min 38 sec

Test stats 🧪

Test	Results
Failed	0
Passed	6525
Skipped	59
Total	6584

💚 Flaky test report

Tests succeeded.

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	98.795% (82/83)	👍
Files	67.114% (200/298)	👍
Classes	65.766% (365/555)	👍
Methods	53.033% (1154/2176)	👍
Lines	38.617% (13180/34130)	👍 0.012
Conditionals	100.0% (0/0)	💚

[pierrehilbert]

buildkite test this

[elastic-sonarqube]

SonarQube Quality Gate

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication