[compiler] Add nesting and scalar handling for getPlausibleName

[maorleger]

Fixes a few known cases where getPlausibleName is not providing the right result

Few examples:

      model Foo<T> {t: T};
      model Box<T> {t: T};
      scalar myInt extends int32;
      @test model Bar {
        stringArrayArray: Array<Array<string>>;
        stringFoo: Foo<string>;
        boxFoo: Box<Foo<string>>;
        int32Array: Array<myInt>;
      }

field	type	before	after
stringArrayArray	Array<Array<string>>	ArrayArray	StringArrayArray
stringFoo	Foo<string>	stringFoo	StringFoo
boxFoo	Box<Foo<string>>	FooBox	StringFooBox
int32Array	Array<myInt>	myIntArray	MyIntArray

Resolves #6961

[github-actions]

All changed packages have been documented.

• ✅ @typespec/compiler

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@typespec/compiler - fix ✏️

Fixes handling of nested templates in getPlausibleName

[azure-sdk]

You can try these changes here

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