[cisco_umbrella] trailing forward slash hint removal

[LaZyDK]

What does this PR do?

I removed the hint for Cisco Managed S3 Bucket instructing us to put a forward slash at the end of the Bucket List Prefix.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Related issues

• Closes [cisco_umbrella] Remove hint for cisco managed s3 Bucket List Prefix #3878

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• Start Time: 2022-09-28T08:49:04.649+0000

• Duration: 13 min 57 sec

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Test	Results
Failed	0
Passed	8
Skipped	0
Total	8

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[LaZyDK]

@P1llus test :)

[efd6]

/test

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[P1llus]

/test

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚
Classes	100.0% (1/1)	💚
Methods	94.444% (17/18)	❕
Lines	92.938% (329/354)	❕
Conditionals	100.0% (0/0)	💚