[Olly] [AWS] Update Billing Overview dashboard

[milan-elastic]

• Bug

What does this PR do?

• Update visualization aggregation from sum to last_value
• Currently, all visualization has sum aggregation which was leading to this issue

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Related issues

• Closes https://github.com/elastic/obs-infraobs-team/issues/1181

Screenshots

Before changes using sum aggregation with 12h period of time

After changes using last_value aggregation with 12h period of time

[elasticmachine]

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Build stats

• Start Time: 2023-10-05T06:15:03.401+0000

• Duration: 55 min 50 sec

Test stats 🧪

Test	Results
Failed	0
Passed	212
Skipped	3
Total	215

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (17/17)	💚
Files	94.444% (17/18)	👎 -5.556
Classes	94.444% (17/18)	👎 -5.556
Methods	86.047% (259/301)	👎 -13.953
Lines	86.075% (7566/8790)	👎 -9.621
Conditionals	100.0% (0/0)	💚

[agithomas]

@milan-elastic , please enable all items in the checklist in the description.

[agithomas]

As the change is related to a bug, please elaborate on what is the issue for which the fix is applied in the changelog.

[milan-elastic]

As the change is related to a bug, please elaborate on what is the issue for which the fix is applied in the changelog.

Done

[agithomas]

Review comments added.

[drewdaemon]

This feels like the right fix 👍

[agithomas]

LGTM!

[elasticmachine]

Package aws - 2.8.1 containing this change is available at https://epr.elastic.co/search?package=aws