Migrated from history panel legacy branch

After eba8385, plot_results creates a "Results" group in the signal
panel, breaking panel-wide index lookups. Use group-local lookups so
the test is robust against extra groups.

(cherry picked from commit 5e08f9c)
(cherry picked from commit b2c4965)

…cenarios

…get and HTML rendering

…el and related components

…story

…ages and replay actions

…ality

(cherry picked from commit 6807861)

…s and add new history panel entries

Split the history feature into dedicated modules, refresh the GUI wiring and widgets, and update the related tests and translations.

# Conflicts:
#	datalab/locale/fr/LC_MESSAGES/datalab.po
#	doc/locale/fr/LC_MESSAGES/release_notes/release_1.03.po
#	doc/release_notes/release_1.03.md

Follow-up to a review noting that ruff/pylint had not been run on the
History panel refactor after it was split into submodules. Cross-module
access to underscore-prefixed members triggered W0212, plus a batch of
other lint warnings that were addressed without disabling any checks.