[RLlib] Fix Algorithm with tune

[smanolloff]

Algorithm.__init__() removes TRIAL_INFO from the config before calling super().__init__(), but it's actually needed by Trainable.

I noticed it because self.trial_id incorrectly returns "default" within a tune experiment. Many other tune-related properties are surely broken as well.

This PR essentially reverts a change made 2y ago: #30042, which may have solved some issue back then, but now it just causes one.

Why are these changes needed?

Related issue number

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• I've included any doc changes needed for https://docs.ray.io/en/master/.
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    method in Tune, I've added it in doc/source/tune/api/ under the
    corresponding .rst file.
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