[cisco_meraki] Improved timezone offset error handling

[ShourieG]

Type of change

• Enhancement

What does this PR do?

Helps improve error handling of timezone field w.r.t the presence of the original time field _temp.ts_nano in the ingest pipeline.

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

• Relates IInvalid ID for ZoneOffset when ingesting data via Elastic Serverless Forwarder

[elasticmachine]

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Build stats

• Start Time: 2023-01-09T05:58:33.829+0000

• Duration: 19 min 46 sec

Test stats 🧪

Test	Results
Failed	0
Passed	19
Skipped	0
Total	19

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (9/9)	💚 2.686
Classes	100.0% (9/9)	💚 2.686
Methods	100.0% (62/62)	💚 8.805
Lines	97.995% (1075/1097)	👍 6.534
Conditionals	100.0% (0/0)	💚

[kcreddy]

Minor change. Rest LGTM

[elasticmachine]

Package cisco_meraki - 1.4.1 containing this change is available at https://epr.elastic.co/search?package=cisco_meraki