Move compiled method installation code from compile to install step

[guillep]

The compile step tries to fill a method with metadata existing on installed methods.
Fetching this existing method and filling the meta-data should be done at the installation step and not the compilation step.

This is important for the bootstrap step, where no prior method exists, and no prior class to look for is there either.

[MarcusDenker]

fails with which I think is not caused by this PR:

SystemNotification: Loading Compression-tonel.1.mcz
[547](https://ci.inria.fr/pharo-ci-jenkins2/job/Test%20pending%20pull%20request%20and%20branch%20Pipeline/job/PR-17469/1/pipeline-console/?start-byte=0&selected-node=26#log-547)
KeyNotFound: key #unzipped not found in MethodDictionary
[548](https://ci.inria.fr/pharo-ci-jenkins2/job/Test%20pending%20pull%20request%20and%20branch%20Pipeline/job/PR-17469/1/pipeline-console/?start-byte=0&selected-node=26#log-548)
MethodDictionary(Dictionary)>>errorKeyNotFound:
[549](https://ci.inria.fr/pharo-ci-jenkins2/job/Test%20pending%20pull%20request%20and%20branch%20Pipeline/job/PR-17469/1/pipeline-console/?start-byte=0&selected-node=26#log-549)
[self errorKeyNotFound: key] in MethodDictionary(Dictionary)>>at: in Block: [self errorKeyNotFound: key]
[550](https://ci.inria.fr/pharo-ci-jenkins2/job/Test%20pending%20pull%20request%20and%20branch%20Pipeline/job/PR-17469/1/pipeline-console/?start-byte=0&selected-node=26#log-550)
MethodDictionary>>at:ifAbsent:
[551](https://ci.inria.fr/pharo-ci-jenkins2/job/Test%20pending%20pull%20request%20and%20branch%20Pipeline/job/PR-17469/1/pipeline-console/?start-byte=0&selected-node=26#log-551)
MethodDictionary(Dictionary)>>at:
[552](https://ci.inria.fr/pharo-ci-jenkins2/job/Test%20pending%20pull%20request%20and%20branch%20Pipeline/job/PR-17469/1/pipeline-console/?start-byte=0&selected-node=26#log-552)
ByteArray class(Behavior)>>compiledMethodAt:

[MarcusDenker]

Ah, this is Pharo12, I added an issue: #17472

[MarcusDenker]

So the Problem

KeyNotFound: key #unzipped not found in MethodDictionary"

Is indeed caused by this PR

[guillep]

I'll check it during the week