o365: increase CEL resource.tracer.maxsize limit

[efd6]

What does this PR do?

The default limit in the Filebeat input is 1MiB which is too small for some responses, resulting in loss of visibility in debugging issues in the integration, so increase to 5MiB.

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.

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• Start Time: 2023-08-28T22:50:26.588+0000

• Duration: 15 min 46 sec

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Test	Results
Failed	0
Passed	25
Skipped	0
Total	25

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚
Classes	100.0% (1/1)	💚
Methods	100.0% (16/16)	💚 25.0
Lines	80.994% (733/905)	👎 -19.006
Conditionals	100.0% (0/0)	💚

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[kcreddy]

LGTM

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Package o365 - 1.21.0 containing this change is available at https://epr.elastic.co/search?package=o365