all: remove confusing fail- prefix from error messages

[efd6]

What does this PR do?

Removes a confusing prefix from enhanced error.message fields.

This was originally added to a pipeline with a specific context of adding a machine-friendly tag to error.message, but through miscommunication was included in all subsequent extended error.message implementations.

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.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Relates [Cisco IOS] Fix parsing when message_count is missing #6919 (comment)

Screenshots

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Start Time: 2023-07-24T01:42:31.998+0000

• Duration: 18 min 2 sec

Test stats 🧪

Test	Results
Failed	0
Passed	180
Skipped	0
Total	180

🤖 GitHub comments

Expand to view the GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (17/17)	💚
Files	100.0% (61/61)	💚
Classes	100.0% (61/61)	💚
Methods	98.312% (466/474)	❕
Lines	86.231% (16320/18926)	❕
Conditionals	100.0% (0/0)	💚

[elasticmachine]

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

[taylor-swanson]

LGTM

[elasticmachine]

Package bitwarden - 1.0.1 containing this change is available at https://epr.elastic.co/search?package=bitwarden

[elasticmachine]

Package cisco_nexus - 0.14.2 containing this change is available at https://epr.elastic.co/search?package=cisco_nexus

[elasticmachine]

Package crowdstrike - 1.16.1 containing this change is available at https://epr.elastic.co/search?package=crowdstrike

[elasticmachine]

Package juniper_srx - 1.13.1 containing this change is available at https://epr.elastic.co/search?package=juniper_srx

[elasticmachine]

Package rapid7_insightvm - 1.0.1 containing this change is available at https://epr.elastic.co/search?package=rapid7_insightvm

[elasticmachine]

Package ti_misp - 1.18.2 containing this change is available at https://epr.elastic.co/search?package=ti_misp

[elasticmachine]

Package trellix_epo_cloud - 1.0.2 containing this change is available at https://epr.elastic.co/search?package=trellix_epo_cloud

[elasticmachine]

Package vectra_detect - 1.0.1 containing this change is available at https://epr.elastic.co/search?package=vectra_detect