Delete ast/format.go and ast/format_test.go

[nathanielc]

This issue is about actually deleting the Go formatter code once it is no longer used.

[skartikey]

currently ast formatter references are present in the following files -

flux/dependencies/influxdb/http.go

Line 263 in 1a84fac

req.Query = ast.Format(file)

flux/internal/cmd/refactortests/cmd/refactortests.go

Line 92 in 1a84fac

fromFile := ast.Format(pkg)

flux/internal/cmd/test_rewriter/main.go

Line 96 in 1a84fac

newScript := ast.Format(astPkg) + "\n"

flux/stdlib/influxdata/influxdb/source.go

Line 164 in 1a84fac

req.Query = ast.Format(s.spec.BuildQuery())

flux/internal/cmd/test_rewriter/add_measurement.go

Line 71 in 1a84fac

sb.WriteString(ast.Format(a) + "\n")