[ti_flashpoint] set X-FP-* headers for HTTP requests

[akshraj-crest]

• Enhancement

Proposed commit message

The Flashpoint API requests now carry the vendor-requested identification
headers: X-FP-IntegrationPlatform is set to "Elastic",
X-FP-IntegrationVersion to the package version and
X-FP-IntegrationPlatformVersion to the Elastic Agent version. Both
versions are taken from the policy template metadata when available
(this is the case for stacks at or above 9.3), otherwise they are set to
"unknown".

The headers are added to the alert, indicator and vulnerability data
streams.

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.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

• [ ]

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Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)

[brijesh-elastic]

LGTM

[efd6]

/test

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✅ All changelog entries have the correct PR link.

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