[Oracle] Modify the dimension field mapping to support public cloud deployment

[agithomas]

• Bug

What does this PR do?

Modify the dimension field mapping to support public cloud deployment

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.

[elasticmachine]

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• Start Time: 2023-05-03T16:35:31.079+0000

• Duration: 30 min 26 sec

Test stats 🧪

Test	Results
Failed	0
Passed	26
Skipped	0
Total	26

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 3.048
Classes	100.0% (1/1)	💚 3.048
Methods	100.0% (29/29)	💚 8.342
Lines	94.318% (249/264)	👍 2.327
Conditionals	100.0% (0/0)	💚

[ritalwar]

LGTM

[elasticmachine]

Package oracle - 1.17.2 containing this change is available at https://epr.elastic.co/search?package=oracle