okta: retain full email address as user.name

[efd6]

Proposed commit message

okta: retain full email address as user.name

The entityanalytics_okta integration retains the full email address
rather than only the username part of the address. This breaks being
able to correlate individual entities with events, in addition to
potentially allowing collision between non-identitical users in events.
So simplify the code and just keep the whole thing.

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.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

• [ ]

How to test this PR locally

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[elastic-vault-github-plugin-prod]

🚀 Benchmarks report

Package okta 👍(0) 💚(0) 💔(1)

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Data stream	Previous EPS	New EPS	Diff (%)	Result
system	1265.82	1028.81	-237.01 (-18.72%)	💔

To see the full report comment with /test benchmark fullreport

[elasticmachine]

💚 Build Succeeded

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• Commit: c167742

cc @efd6

[elasticmachine]

Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
83.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube