x-pack/filebeat/module/salesforce: Remove dashboards

[kush-elastic]

Description

This PR aims to remove dashboards from the recently revamped Salesforce module. The plan is to discontinue support for dashboards created in version 7.15.0, as the overall Beats framework has ceased support for version 8.X.X dashboards.

For the newer dashboards, support will continue in the upcoming revamp of the Salesforce Integration, ensuring that the latest features and functionalities are available for users.

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] I have made corresponding change to the default configuration files
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Related issues

• Relates https://github.com/elastic/obs-infraobs-team/issues/1277
• Relates https://github.com/elastic/obs-infraobs-team/issues/1248

[botelastic[bot]]

This pull request doesn't have a Team:<team> label.

[mergify[bot]]

This pull request does not have a backport label. If this is a bug or security fix, could you label this PR @kush-elastic? 🙏. For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

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[kush-elastic]

Hey @tommyers-elastic, We need your approval on this PR as part of removing dashboards from Salesforce module.