RHOAIENG-16403: chore(Makefile): implement .ONESHELL: and .SHELLFLAGS := -eu -o pipefail -c in Makefile

[jiridanek]

https://issues.redhat.com/browse/RHOAIENG-16403

Description

https://tech.davis-hansson.com/p/make/ says all this is a good idea

Currently we have this

• RHOAIENG-16149: chore(Makefile): implement advice from avis-hansson.com/p/make/ #778

# https://tech.davis-hansson.com/p/make/
SHELL := bash
# todo: do not set .ONESHELL: for now
# http://redsymbol.net/articles/unofficial-bash-strict-mode/
#.SHELLFLAGS := -eu -o pipefail -c
.DELETE_ON_ERROR:
MAKEFLAGS += --warn-undefined-variables
MAKEFLAGS += --no-builtin-rules

# todo: leave the default recipe prefix for now
ifeq ($(origin .RECIPEPREFIX), undefined)
  $(error This Make does not support .RECIPEPREFIX. Please use GNU Make 4.0 or later)
endif
.RECIPEPREFIX =

Let's uncomment the shell-related parts.

How Has This Been Tested?

• https://github.com/jiridanek/notebooks/actions/runs/12135631481

It causes a failure in all python 3.9 workbenches,

Notebook JSON is invalid: Additional properties are not allowed ('id' was unexpected)
[...]
command terminated with exit code 1
make: *** [Makefile:495: test-jupyter-minimal-ubi9-python-3.9] Error 1

Maybe they all should fail?

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

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[jiridanek]

/retest-required