This commit adds the `goheader` rule to `golangci-lint` to enforce that
all our Go source code includes appropriate licence headers, fixing up
files that currently fail that check.
---------
Co-authored-by: Will Jones <will@sacharissa.co.uk>
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# Description
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Prompted by a comment in another review:
https://github.com/pulumi/pulumi/pull/14654#discussion_r1419995945
This lints that we don't use `fmt.Errorf` when `errors.New` will
suffice, it also covers a load of other cases where `Sprintf` is
sub-optimal.
Most of these edits were made by running `perfsprint --fix`.
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- [x] I have formatted my code using `gofumpt`
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# Description
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Likewise `require.NoError` instead of `require.Nil`, and `assert.Error`
rather than `assert.NotNil`.
The error variants of these functions print the errors nicer for test
failures using `Error()` rather than `GoString()`.
For bail errors this is _much_ better than the `result.Result` days
where we now get errors like:
```
Error: Received unexpected error:
BAIL: inner error
```
instead of:
```
Error: Expected nil, but got: &simpleResult{}
```
Also print the bail error in `TestPlan.Run` so we can see the
description of it.