[imperva] Undefined log.file.* fields breaking tests for filestream inputs

[janvi-elastic]

Type of change

• Enhancement

What does this PR do?

Issue:

FAILURE DETAILS:
imperva/securesphere logfile:
[0] parsing field value failed: field "log.file.device_id"'s Go type, string, does not match the expected field type: long (field value: 68)
[1] parsing field value failed: field "log.file.inode"'s Go type, string, does not match the expected field type: long (field value: 98)

• Resolve above issue by updating log.file.* fields to keyword to prevent a field type mismatch error and added new filestream fields .

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

elastic-package test

Related issues

• Closes [imperva/securesphere] log.file.* fields mapped as long not keyword #8469

Screenshots

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• Start Time: 2023-12-04T06:53:20.077+0000

• Duration: 19 min 53 sec

Test stats 🧪

Test	Results
Failed	0
Passed	9
Skipped	0
Total	9

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 3.814
Classes	100.0% (1/1)	💚 3.814
Methods	100.0% (10/10)	💚 7.74
Lines	79.078% (223/282)	👎 -9.577
Conditionals	100.0% (0/0)	💚

[efd6]

Suggested change

	- version: "0.21.0"
	changes:
	- description: Adapt fields for changes in file system info.
	type: enhancement
	- version: "0.20.1"
	changes:
	- description: Adapt fields for changes in file system info.
	type: bugfix

[efd6]

Suggested change

	version: "0.21.0"
	version: "0.20.1"

[efd6]

/test

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