No diagnostic about static member in object expression

[edgarfgp]

Follow-up: #16250.

• Object expressions should skip checking for non-instance members.
• Implementing static members which will be unusable at the instance level.

[edgarfgp]

This is ready

[psfinaki]

So looks like IWSAMs are fine? Thanks for the extra testing :)

[edgarfgp]

So looks like IWSAMs are fine? Thanks for the extra testing :)

Yes and added more tests in my last commit.

[edgarfgp]

As discussed with @vzarytovskii This PR:

• Avoid checking for static members in object expressions. As this can NOT be used on an instance
• Reuses error 3860 with an updated message to prevent runtime errors when an object expression attempts to implement an interfaces with static abstract members.

[vzarytovskii]

Thanks!