Find templates affected by the Angular Material 15 MDC components

Finds .html templates and inline template metadata of projects not on Material 15 yet that use component APIs the MDC-based components of Angular Material 15 changed: <mat-chip-list> and chip selection, the old slider markup, the legacy and standard form field appearances, floatLabel="never", <mat-placeholder>, matLine, matListIcon and matListAvatar in lists, a mat-tab-nav-bar without tabPanel, and the mat-card-content attribute, selection on chips in a <mat-chip-grid>, and form fields that relied on the legacy appearance to show the placeholder as the label, unless MAT_FORM_FIELD_DEFAULT_OPTIONS sets another default appearance.