Make exchange manager conditional

[yardenc2003]

Currently the exchange manager properties file is always created via Helm chart although this is considered as an optional configuration in Trino. In this PR I made its creation conditional according to whether or not the .Values.server.exchangeManager was set.

I also removed the condition in its properties file, that links between exchamge-manager.name=filesystem to exchange.base-directories existence, as they are not dependent (you can see here that this configuration supports also hdfs as the value of exchamge-manager.name).

Note:

1. I was thinking of uniting .Values.server.exchangeManager and .Values.server.additionalExchangeManagerProperties as it seems more convenient to have all the exchange manager configurations in the same place, but then I noticed it's being done the same way in other places, such as log.properties and node.properties, so I kept it for now.
2. I didn't figure out how to include the description I added to the values file in the README.md. I found that only some things where generated via the pre-commit, but not all of them, help would be appreciated.

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[nineinchnick]

I've labeled this as a breaking change, since this removes some default values, that people using FTE might rely on. It's just for the sake of generating release notes in the next release.

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[yardenc2003]

@cla-bot check

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[yardenc2003]

@cla-bot check

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The cla-bot has been summoned, and re-checked this pull request!

[nineinchnick]

@yardenc2003 the tests are failing in the CI