m365_defender: fix template snippet escaping behaviour and add event.kind for pipeline errors

[efd6]

What does this PR do?

See title.

(The majority of the work fixing template snippets in m365_defender was done in #7522, so this is just to knock it on the head).

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.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• For sei: packages potentially using incorrect mustache snippet escaping #7641

Screenshots

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• Start Time: 2023-09-07T21:59:25.766+0000

• Duration: 16 min 51 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% (3/3)	💚
Files	100.0% (7/7)	💚 5.556
Classes	100.0% (7/7)	💚 5.556
Methods	85.556% (77/90)	👎 -0.398
Lines	92.596% (5590/6037)	👍 6.572
Conditionals	100.0% (0/0)	💚

[elasticmachine]

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

[bhapas]

LGTM

[elasticmachine]

Package m365_defender - 2.0.1 containing this change is available at https://epr.elastic.co/search?package=m365_defender