Update the CRW-2.15>DS-3.0 to CRW-2.15>DS-3.0.1

✔ 1. Update :devworkspace-operator-version-patch: 0.14.1 to 0.15.2 (https://coreos.slack.com/archives/C0324DHHGKY/p1660036808125699)

✔ 2. Update the line in step 5 of the procedure
`export PRODUCT_OLM_STARTING_CSV=devspacesoperator.v3.0.0` to `v3.0.1` among the migration environment variables in https://access.redhat.com/documentation/en-us/red_hat_openshift_dev_spaces/3.0/html-single/administration_guide/index#manually-upgrading-crw-2.15-to-devspaces-3.0-on-red-hat-openshift

✔✔ 3. Update `export PRE_MIGRATION_PRODUCT_OPERATOR_NAMESPACE=openshift-devspaces` to `export PRE_MIGRATION_PRODUCT_OPERATOR_NAMESPACE=openshift-workspaces`
in
https://access.redhat.com/documentation/en-us/red_hat_openshift_dev_spaces/3.0/html-single/administration_guide/index#manually-upgrading-crw-2.15-to-devspaces-3.0-on-red-hat-openshift
and in
https://access.redhat.com/documentation/en-us/red_hat_openshift_dev_spaces/3.0/html-single/administration_guide/index#rolling-the-upgrade-back-to-crw-2.15-on-red-hat-openshift
(CRW 2.15 docs link to https://gitlab.cee.redhat.com/red-hat-developers-documentation/red-hat-devtools/-/blob/CLX3-Red_Hat_CodeReady_Workspaces-2.15-Administration_Guide/docs/titles/crw/meta/product-attributes.adoc)

✔✔✔ 4. Add a new prerequisite to : `* OpenShift Container Platform 4.10 or OpenShift Dedicated 4.10 or Red Hat OpenShift Service on AWS (ROSA) 4.10.`
in
https://access.redhat.com/documentation/en-us/red_hat_openshift_dev_spaces/3.0/html-single/administration_guide/index#manually-upgrading-crw-2.15-to-devspaces-3.0-on-red-hat-openshift
and in
https://access.redhat.com/documentation/en-us/red_hat_openshift_dev_spaces/3.0/html-single/administration_guide/index#rolling-the-upgrade-back-to-crw-2.15-on-red-hat-openshift

and in

https://red-hat-developers-documentation.pages.redhat.com/red-hat-devtools/devspaces/ccutil/administration-guide/#upgrading-crw-2.15-to-devspaces-3.1-on-red-hat-openshift

because

• 2.15 is supported on ONLY <= 4.10.
• 3.0.z is supported on ONLY 4.10.

5. For the 3.0 docs, update `:prod-ver-patch: 3.0.1` in product-attributes.adoc

6.

For customers who already upgraded to 3.0.0, an OLM upgrade is required from 3.0.0 to 3.0.1 (need to watch the Cabal call recording; the related KI is already drafted)

IMPORTANT: Both the 3.0 and 3.1 docs require relevant updates.

WIP on the description.