[hid_bravura_monitor] Use ECS definition for message and tags

[andrewkroh]

What does this PR do?

For field type consistency, use the ECS value for message and tags.

Also fix an inconsistency between the data streams for the processors variable description.

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.

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

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• Start Time: 2023-09-19T20:13:15.251+0000

• Duration: 15 min 55 sec

Test stats 🧪

Test	Results
Failed	0
Passed	51
Skipped	0
Total	51

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚 5.772
Classes	100.0% (2/2)	💚 5.772
Methods	92.0% (23/25)	👍 0.591
Lines	98.239% (502/511)	👍 11.19
Conditionals	100.0% (0/0)	💚

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Package hid_bravura_monitor - 1.11.1 containing this change is available at https://epr.elastic.co/search?package=hid_bravura_monitor