[cisco_nexus] Add support for new log format

[piyush-elastic]

Type of change

• Enhancement

What does this PR do?

Add support for new log format

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.

How to test this PR locally

Clone integrations repo.
Install elastic package locally.
Start elastic stack using elastic-package.
Move to integrations/packages/cisco_nexus directory.
Run the following command to run tests.

Automated Test

Elastic Package Test.txt

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-06-22T06:48:06.978+0000

• Duration: 15 min 5 sec

Test stats 🧪

Test	Results
Failed	0
Passed	10
Skipped	0
Total	10

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (2/2)	💚 2.937
Classes	100.0% (2/2)	💚 2.937
Methods	100.0% (20/20)	💚 7.998
Lines	82.967% (453/546)	👎 -8.692
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package cisco_nexus - 0.14.1 containing this change is available at https://epr.elastic.co/search?package=cisco_nexus