[8.10](backport #3441) Switch ESS region to azure-eastus2 for integ tests

[mergify]

This is an automatic backport of pull request #3441 done by Mergify.

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[elasticmachine]

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• Start Time: 2023-09-21T09:44:31.052+0000

• Duration: 29 min 8 sec

Test stats 🧪

Test	Results
Failed	0
Passed	6251
Skipped	57
Total	6308

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	98.765% (80/81)	👍
Files	67.719% (193/285)	👍
Classes	66.292% (354/534)	👍
Methods	52.978% (1112/2099)	👎 -0.025
Lines	38.593% (12674/32840)	👎 -0.025
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Pinging @elastic/elastic-agent (Team:Elastic-Agent)

[pchila]

@Mergifyio rebase

[mergify]

rebase

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