fix: make auto-width and text-align usable in custom slot

[DiegoCardoso]

Description

Fix issues when vaadin-grid is used in a custom component and its column defined via <slot>:

• Check for assignedSlot when transversing the parent tree to calculate intrinsic width when auto-width is used
• Check for this._grid when the text-align is set, because the parent custom component might not be defined by the time the vaadin-grid-column is attached to the DOM

Fixes #6475

Type of change

• Bugfix
• Feature

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[vaadin-bot]

Hi @DiegoCardoso and @DiegoCardoso, when i performed cherry-pick to this commit to 24.2, i have encountered the following issue. Can you take a look and pick it manually?
Error Message:
Error: Command failed: git cherry-pick b3b9528
error: could not apply b3b9528... fix: make auto-width and text-align usable in custom slot (#6602)
hint: After resolving the conflicts, mark them with
hint: "git add/rm ", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

[vaadin-bot]

Hi @DiegoCardoso and @DiegoCardoso, when i performed cherry-pick to this commit to 24.1, i have encountered the following issue. Can you take a look and pick it manually?
Error Message:
Error: Command failed: git cherry-pick b3b9528
error: could not apply b3b9528... fix: make auto-width and text-align usable in custom slot (#6602)
hint: After resolving the conflicts, mark them with
hint: "git add/rm ", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

[vaadin-bot]

Hi @DiegoCardoso and @DiegoCardoso, when i performed cherry-pick to this commit to 23.3, i have encountered the following issue. Can you take a look and pick it manually?
Error Message:
Error: Command failed: git cherry-pick b3b9528
error: could not apply b3b9528... fix: make auto-width and text-align usable in custom slot (#6602)
hint: After resolving the conflicts, mark them with
hint: "git add/rm ", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".