IDLE search and replace should use 'hit' tag instead of 'hilite'

GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2017-01-28.01:03:15.392>
labels = ['expert-IDLE', 'type-feature', '3.10']
title = "IDLE search and replace should use 'hit' tag instead of 'hilite'"
updated_at = <Date 2020-06-06.22:09:25.323>
user = 'https://bugs.python.org/ds2'

bugs.python.org fields:

activity = <Date 2020-06-06.22:09:25.323>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2017-01-28.01:03:15.392>
creator = 'd s2'
dependencies = []
files = []
hgrepos = []
issue_num = 29382
keywords = []
message_count = 3.0
messages = ['286393', '286395', '286397']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'd s2']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue29382'
versions = ['Python 3.10']