[release-3.1] 3.1.1 backports and release notes (#490)

* Bump SUMA to 5.0.0 (#467)

Signed-off-by: Atanas Dinov <[email protected]>

* Add Elemental extension chart (#468)

Signed-off-by: Atanas Dinov <[email protected]>

* Add some performance configs and 3.1 fixes (#475)

* Bump SUMA to 5.0.0 (#467)

Signed-off-by: Atanas Dinov <[email protected]>

* Add Elemental extension chart (#468)

Signed-off-by: Atanas Dinov <[email protected]>

* update with performance config and some 3.1 fixes

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Signed-off-by: Atanas Dinov <[email protected]>
Co-authored-by: Atanas Dinov <[email protected]>
(cherry picked from commit ccf3dc6)

* Minor ATIP doc fix (#479)

(cherry picked from commit 7600d1f)

* "Day 2" related documentation changes and improvements for 3.1.1 (#483)

* Documentation improvements

* Naming standartization changes

* Add important notes

* Fix spelling mistakes

* Bump helm day2 doc with correct release tag

(cherry picked from commit bcafd4b)

* Prepare releasenotes for 3.1.1 release

(cherry picked from commit 83f6daa)

* Update RKE2/K3s version to 1.30.5

(cherry picked from commit 1e5cd91)

* Update Rancher version

(cherry picked from commit d6bcaf4)

* Update metal3 to 0.8.3

(cherry picked from commit 86d2798)

* Update rancher-turtles to 0.3.3

(cherry picked from commit 40990db)

* Update airgap image list for 3.1.1

Co-authored-by: Atanas Dinov <[email protected]>
(cherry picked from commit 1a314e9)

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Signed-off-by: Atanas Dinov <[email protected]>
Co-authored-by: Atanas Dinov <[email protected]>
Co-authored-by: Alberto Morgante Medina <[email protected]>
Co-authored-by: Ivo Petrov <[email protected]>