[SQL Migration] [Bugfix] Not able to migrate few of the assessed DBs, it always selects all assessed.

[stuti149]

Bug : Bug 2824863: We are not able to migrate few of the assessed DBs, it always selects all assessed.

Fix: Change1 : remove await this._body.treeComponent.initialize(this.migrationStateModel); from executechange method &
change const selectedDbs = this._dbNames.filter(db => this.model._databasesForAssessments.includes(db)); to
const selectedDbs = this._dbNames.filter(db => this.model._databasesForMigration.includes(db));

Change 2: Due to above change, when a tde enabled db is selected, tde info container was not showing up.
Fix: Update this.model._databasesForMigration = this.selectedDbs(); whenever any db is selected or unselected. This require pass of migrationstatemodel to treecomponent.

Change 3: Update select db count whenever a db is selected or unselected.
this._databaseCount.value = constants.DATABASES(selectedDbs.length, this.model._databasesForAssessment?.length)

Change2 & change3 are done to accomodate bugfix change

[coveralls]

Pull Request Test Coverage Report for Build 6945203592

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 41.569%

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Totals
Change from base Build 6937690638:	0.0%
Covered Lines:	30791
Relevant Lines:	69372

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💛 - Coveralls