feat: Removed attach command

[jirihnidek]

• Card ID: CCT-425

Attach command

• Removed attach command
• Removed --auto-attach and --autosubscribe CLI options of register command
• Removed --servicelevel CLI option of register command too, because this CLI option was possible to use only with --auto-attach CLI option. Thus, it does not make sense to keep this option
• Removed unit tests for attach command
• Modified unit tests for register command. Only SCA mode is considered.
• Modified man pages

D-Bus

• Removed interface: com.redhat.RHSM1.Attach
• Removed AutoAttach and PoolAttach
• Modified Register method
• Removed unit tests related to removed methods
• Modified unit tests of register D-Bus methods

Attach service

• Removed attach service
• Removed unit tests related to attach service

[github-actions[bot]]

Coverage (computed on Fedora latest) •

File	Stmts	Miss	Cover	Missing
__init__.py	0	0	100%
rhsmlib/dbus/objects
__init__.py	8	0	100%
register.py	201	62	69%	35, 88–89, 102–103, 113–114, 116–117, 127–128, 130, 144, 147, 160, 163, 202, 211, 249–250, 257, 275, 283, 286, 329–331, 333–334, 353–356, 358–360, 362, 364, 366, 381, 385, 402–407, 409–411, 413, 415, 427–431, 433–435, 437, 439
subscription_manager
managercli.py	48	12	75%	22, 80–82, 84, 86–91, 95
subscription_manager/cli_command
cli.py	206	28	86%	64, 68, 124, 181, 185, 187, 230, 269, 280–282, 296–298, 321, 341, 367, 376–377, 381–382, 398, 400–401, 403–404, 409, 417
register.py	204	45	77%	120, 122, 165–167, 169–170, 173, 184, 188, 195–198, 202–203, 207–208, 219, 247, 251–253, 262, 266, 292, 308–309, 345, 374, 382, 397–399, 408, 439, 449–450, 457–458, 463–467
subscription_manager/scripts
rhsm_service.py	15	15	0%	17, 19–20, 23, 26–28, 31–33, 43–45, 48–49
TOTAL	18014	4538	74%

Tests	Skipped	Failures	Errors	Time
2534	14 :zzz:	0 :x:	0 :fire:	34.229s :stopwatch:

[ptoscano]

This must not be merged before https://github.com/candlepin/subscription-manager-cockpit/pull/68 is merged, otherwise the cockpit tests will fail (like they currently do).