fix: constraint interfaces generation

[Alhanaqtah]

Description

I added a check to the parser for whether the interface is a constraint. Mocks will not be generated using such interfaces.

Examples of interfaces that will be skipped:

type Skip1 constraints.Ordered

type Skip2 interface {
	~int
}

type Skip3 interface {
	constraints.Float
}

type Skip4 interface {
	constraints.Float | constraints.Integer
}

type Skip5 Skip1

type Skip6 interface {
	Skip5
}

• Fixes Mocks generated for constraint interfaces/anys #1113

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Version of Go used when building/testing:

• 1.25.1

How Has This Been Tested?

I wrote a test in fixtures with several constraint interfaces. If no mocks are generated for them, the test will be completed successfully.
Fixture path: internal/fixtures/constraint_ifaces

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[LandonTClipp]

I think this is fine but it's easily tricked. You can create an alias to a constraints.Float and this check would not catch it. You would need an additional check for alias types, then resolve the alias, then perform the same checks you added here.

That doesn't have to be included in this PR, but it's something to think about. You mention this in the description so I'm not telling you something new.

[Alhanaqtah]

Hi. Thanks for the tip. Thanks to this, i also found a way to check aliases for constraint interfaces

[LandonTClipp]

I haven't forgotten this, I will get to it soon!

[LandonTClipp]

Merged, thanks again 🫡