Disable Metricbeat mssql module in FIPS builds

[ycombinator]

Proposed commit message

This PR (similar to #43480) ensures that the Metricbeat mssql module code is only compiled in non-FIPS builds of Metricbeat and is, therefore, unavailable in FIPS-capable Metricbeat artifacts.

The module indirectly depends on the Azure Go SDK. The SDK's code uses the golang.org/x/crypto/pkcs12 package, which is not FIPS-compliant, and the SDK doesn't plan to offer a way to disable the use of this package at compile time (see Azure/azure-sdk-for-go#24336).

As such, we have little choice but to exclude the mssql module from FIPS-capable Metricbeat builds.

The doc.go files added to every metricset in the mssql module are to prevent compile-time errors like so:

build constraints exclude all Go files in x-pack/metricbeat/module/mssql/performance

Checklist

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

Disruptive User Impact

FIPS-capable artifacts of Metricbeat will not contain the mssql module.

[botelastic]

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[github-actions]

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Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @ycombinator? 🙏.
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-8./d is the label to automatically backport to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
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