Remove the quadruple dollar hack

[dmitryax]

Double expansion issue was fixed with the recent splunk-otel-collector upgrade. Now OTel collector configs are expanded only once and hack with $$$$ is not needed anymore.

• temporary set the splunk-otel-collector docker image to the latest dev version to keep the main in a working state.

[rockb1017]

I see that $$$$ is changed to $$.
but I think $$ should also be changed to $.

[dmitryax]

I see $$ only in places like $$.logtag which are supposed to work as expected and should stay the same. They didn't require $$$$ before because double expansion would be the following: $$.logtag -> $.logtag -> $.logtag, while double expansion of $$body: $$body -> $body -> "".

[rockb1017]

oh hmm I see. thanks for explanation. that is why the CI pipeline worked. I was wondering.. LGTM!

[rockb1017]

so it will work with just one $ for $.* ?

[dmitryax]

so it will work with just one $ for $.* ?

It will, but I would leave it with $$ for consistency. Otherwise people may be confused when to use one and when two signs.