[8.x] [Fleet] add escapeMultilineString Handlebar helper (#195159) #195497
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## Summary
Adding a handlebar helper to escape multiline strings. It has the same
function as `escapeStringHelper`, but does not wrap strings in single
quotes, allowing concatenation of escaped variables in the `hbs`
template such as this example:
```hbs
audit_rules: "{{escape_multiline_string audit_rules}}
{{escape_multiline_string "
# Session data audit rules
-a always,exit -F arch=b64 -S execve,execveat -k exec
-a always,exit -F arch=b64 -S exit_group
-a always,exit -F arch=b64 -S setsid"}}"
{{else}}
{{#if audit_rules}}
audit_rules: {{escape_string audit_rules}}
{{/if}}
{{/if}}
```
The above would not be possible using only `escape_string` as
`audit_rules` would be wrapped in single quotes.
## Screenshots
The example above illustrates how this option allows the Auditd manager
integration to append Session data audit rules to the `audit_rules`
field when Session data is enabled in the integration
([PR](elastic/integrations#11336)).
<img width="872" alt="image"
src="https://github.com/user-attachments/assets/325d784d-26a4-4dfe-9d0e-54d51c3ed060">
<img width="801" alt="image"
src="https://github.com/user-attachments/assets/ebd521c0-4471-48f9-ba8d-94630ea0efd2">
(cherry picked from commit 407137a)
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animehart
approved these changes
Oct 9, 2024
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