[cisco_meraki] Add event.action and message to specific events

[LaZyDK]

What does this PR do?

Add event.action to: cisco_meraki.event_subtype: multiple_dhcp_servers_detected

Keep important information in message field for cisco_meraki.event_subtype:

• dhcp
• client_vpn_connect
• blocked
• port

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_meraki] Add event.action and message to specific events #7790
• Requires cisco_meraki: handle blocked ARP packet, auth and port messages #7771

[elasticmachine]

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Build stats

• Start Time: 2023-09-22T15:16:48.186+0000

• Duration: 18 min 23 sec

Test stats 🧪

Test	Results
Failed	0
Passed	19
Skipped	0
Total	19

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[elasticmachine]

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

[efd6]

/test

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (9/9)	💚 29.412
Classes	100.0% (9/9)	💚 29.412
Methods	100.0% (66/66)	💚 43.182
Lines	98.161% (1174/1196)	👍 58.2
Conditionals	100.0% (0/0)	💚

[LaZyDK]

Ready for another test

[LaZyDK]

Fixed conflicts. Ready again.

[efd6]

/test

[andrewkroh]

/test

[elasticmachine]

Package cisco_meraki - 1.15.0 containing this change is available at https://epr.elastic.co/search?package=cisco_meraki