Make datadog message, escalation_message, and query work with heredoc

[multilinear]

I wrote this patch for my own company (Meteor), after running in to the issue covered by:
#5642
This patch uses the same fix suggested there, just applied to a couple other relevant fields where heredocs are desirable. Datadog didn't seem to strip "name" based on my testing.

Here's the output from a run of the acceptance tests (including the one I'm adding)

==> Checking that code complies with gofmt requirements...
/usr/bin/stringer
go generate $(go list ./... | grep -v /vendor/)
TF_ACC=1 go test ./builtin/providers/datadog -v -timeout 120m
=== RUN TestProvider
--- PASS: TestProvider (0.00s)
=== RUN TestProvider_impl
--- PASS: TestProvider_impl (0.00s)
=== RUN TestAccDatadogMonitor_Basic
--- PASS: TestAccDatadogMonitor_Basic (97.48s)
=== RUN TestAccDatadogMonitor_Updated
--- PASS: TestAccDatadogMonitor_Updated (95.86s)
=== RUN TestAccDatadogMonitor_TrimWhitespace
--- PASS: TestAccDatadogMonitor_TrimWhitespace (68.40s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/datadog 261.738s

Sorry if I missed anything... first time contributing to terraform :).

[ojongerius]

Nice one! LGTM

[billputer]

👍

[multilinear]

Is there anything else I should do? Or are we just waiting for someone with magic bits to wander by and click merge?

[ojongerius]

Yeah I think we are waiting for someone with commit rights to merge.

@jen20 merged the original provider and @stack72 labeled this PR. Anything we can do to get this merged?

[stack72]

@multilinear thanks for the PR - this looks good to me :)

[ojongerius]

Thanks @stack72

[ghost]

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