[Enhancement] [Zscaler ZPA] Make enhancement in connector with best practices implementation

[vinit-chauhan]

Type of change

• Enhancement

What does this PR do?

Make enhancement in Zscaler ZPA connector with listed best practices.

Sr. No.	Best Practices
1	Verify best practices test cases are executed
2	Verify all automated tests
3	Verify default values of port for TCP, UDP or HTTP Endpoint Input
4	Verify that the data is ingested in kibana for in interval
5	Verify all fields are correctly mapped for all Data streams
6	Verify related.ip field in datastream
7	Verify network.protocol is in lowercase form
8	Verify with invalid longitude range. [Valid Range : -180 to 180 for longitude]
9	Verify with invalid latitude range. [Valid Range: -90 to 90 for latitude]
10	Verify format of title of dashboard
11	Verify Datastream Dashboard
12	Verify filters in visualizations
13	Verify visualizations in different browser
14	Verify README file

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/zscaler_zpa directory.
• Run the following command to run tests.

elastic-package test

Related issues

• Relates Make enhancement in connectors with best practices implementation #4535

Screenshots

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

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Build stats

• Start Time: 2022-11-15T11:06:55.588+0000

• Duration: 18 min 10 sec

Test stats 🧪

Test	Results
Failed	0
Passed	30
Skipped	0
Total	30

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (5/5)	💚
Files	100.0% (5/5)	💚 2.542
Classes	100.0% (5/5)	💚 2.542
Methods	100.0% (59/59)	💚 9.137
Lines	90.175% (1542/1710)	👎 -1.449
Conditionals	100.0% (0/0)	💚