fix(plugin-workflow): add loading for adding node

[mytharcher]

Description

Add loading for adding node.

Steps to reproduce

Small possibility no reaction from server when adding node for a while, and quickly add another node, newly added node will be lost from the canvas but exist in data.

Expected behavior

No un-fully-linked node.

Actual behavior

Un-fully-linked node exists.

Related issues

None.

Reason

Need waiting for response from server.

Solution

Add loading status for button of adding node.

[height]

This pull request has been linked to 1 task:

• T-4628 添加节点时，小概率情况当事务卡住时，导致的重复添加同一个节点后，会出现悬空的节点，无法在画布上显示，但影响流程运行 (unlink task)

💡Tip: Add "Close T-4628" to the pull request title or description, to a commit message, or in a comment to mark this task as "Done" when the pull request is merged.

[github-actions]

Tests results for "E2E"

9 flaky

⚠️ [chromium] › core/client/src/modules/blocks/data-blocks/form/__e2e__/form-create/lazyLoadAssociationFields.test.ts💯7 › association fields › should be possible to change the value of the association field normally
⚠️ [chromium] › core/client/src/modules/popup/__e2e__/schemaInitializer1.test.ts:135:7 › where to open a popup and what can be added to it › bulk edit
⚠️ [chromium] › plugins/@nocobase/plugin-action-bulk-edit/src/client/__e2e__/schemaSettings.test.ts:14:7 › bulk edit action setting › data will be updated && edit form configure
⚠️ [chromium] › plugins/@nocobase/plugin-action-bulk-edit/src/client/__e2e__/schemaInitailizer.test.ts:14:7 › TableActionInitializers & GanttActionInitializers & MapActionInitializers should add bulk edit action › bulk edit in TableActionInitializers
⚠️ [chromium] › plugins/@nocobase/plugin-auth/src/client/__e2e__/auth.test.ts:21:7 › auth › register
⚠️ [chromium] › plugins/@nocobase/plugin-kanban/src/client/__e2e__/schemaSettings.test.ts:15:7 › configure setting › set the data scope
⚠️ [chromium] › core/client/src/modules/blocks/data-blocks/grid-card/__e2e__/schemaInitializer.test.ts:30:7 › where grid card block can be added › popup
⚠️ [chromium] › core/client/src/modules/blocks/data-blocks/list/__e2e__/schemaInitializer.test.ts:29:7 › where list block can be added › popup
⚠️ [chromium] › plugins/@nocobase/plugin-acl/src/client/__e2e__/configure.test.ts:13:5 › allows to configure interface

986 passed, 30 skipped
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