[Gb200] Support IMEX configuration to be local to a node (#3029)

* we remove /opt/parallelcluster/shared/nvidia-imex directory creation
* We keep default path of `/etc/nvidia-imex/nodes_config.cfg` and `/etc/nvidia-imex/config.cfg` for IMEX configuration
* We override `/etc/nvidia-imex/nodes_config.cfg` only if it is missing to avoid Imex start failures.
* Update unit test

Co-authored-by: Himani Anil Deshpande <[email protected]>

[Docs] Revise changelog for version 3.13.2 (#2981)

* Update CHANGELOG entries for 3.13.2 release

[Doc] Update 3.13.1 changelog: bugfix on AD passwd reset script

Consider string "true" as turning on Lustre, Nvidia installation

Signed-off-by: Hanwen <[email protected]>

Remove minor version pining (#2854)

[Test] Fix kitchen test related to enroot

Signed-off-by: Giacomo Marciani <[email protected]>

Adding Attribution Document for Cookbook (#2811)

Co-authored-by: Himani Deshpande <[email protected]>

[Docs] Add changelog entry for version 3.10.1.

Signed-off-by: Giacomo Marciani <[email protected]>

Improve 3.10.0 changelog

Signed-off-by: Hanwen <[email protected]>

[Storage] Fix method used to get the AWS domain for FSx.

In particular, now it does not need anymore to access the undefined
node attribute in US ISO regions.

Signed-off-by: Giacomo Marciani <[email protected]>