Schedule ULSCH in flexible slots in InitialBWP

Schedule ULSCH in flexible slots in InitialBWP, the scheduling limitation for ULSCH in flexible slots no longer exists. This MR also closes issue #549 (closed)

changed milestone to %REVIEW_CAN_START

added 5G-NR label

assigned to @francescomani

OAI RAN-CI-develop build (4025): Some Changed files in Merge Request DO NOT follow OAI Formatting Rules

mentioned in issue #549 (closed)

OAI RAN-CI-develop build (4025): passed (https://open5glab.eurecom.fr:8083/jenkins/job/RAN-CI-develop/4025/)

mentioned in issue #525 (closed)

OAI RAN-Container-Parent build (2642): passed (https://jenkins-oai.eurecom.fr/job/RAN-Container-Parent/2642/)

@luis_pereira87 note that in RAN-Container-Parent, I still did not add an UL traffic test (I will try to finalize MR !1660 (merged) and do that in there). Are you sure this issue is not present anymore/you tested?

changed milestone to %REVIEW_COMPLETED_AND_APPROVED

resolved all threads

changed milestone to %OK_TO_BE_MERGED

mentioned in merge request !1689 (merged)

mentioned in commit 474cde3b

merged