[Look&Feel] Notebooks Density and Consistency Improvements

[danieldong51]

Description

This PR applies the Look & Feel density and consistency changes to Notebooks:

1. Use small context menus
2. Use small tabs
3. Standardize paragraph size (15.75px next theme / 14px V7 theme)
4. Use semantic headers (H1s on main pages, H2s on modals/flyouts)
5. Modal/Flyout Typography
6. Buttons for actions, only using primary buttons for primary calls to action
7. Use small padding on popovers

Screenshots

Small context Menu

Scope	Before	After
Notebook: Header Reporting
Notebook: Header Paragraph
Notebook: Header Notebook
Notebook: Add
Notebook: Paragraph
Notebook: Listing

Paragraph size

Scope	Before	After
Notebooks: Empty overview
Notebooks: Empty notebook
Notebooks: Timestamp
Notebooks: Created
Notebooks: Quickstart

Semantic Headers

Scope	Before	After
Notebooks: Overview
Notebooks: Title

Modals

Scope	Before	After
Notebooks: Browse Vis
Notebooks: Duplicate
Notebooks: Delete
Delete All Paragraphs
Delete Header
Sample

Buttons

Scope	Before	After
Refresh

Check List

• [ ] New functionality includes testing.
  • [ ] All tests pass, including unit test, integration test and doctest
• [ ] New functionality has been documented.
  • [ ] New functionality has javadoc added
  • [ ] New functionality has user manual doc added
• [ ] Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license. For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 54.75%. Comparing base (c3ab50f) to head (1b698e9). Report is 56 commits behind head on main.

Files	Patch %	Lines
...oks/components/paragraph_components/para_input.tsx	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2073 +/- ## ========================================== - Coverage 57.85% 54.75% -3.10% ========================================== Files 372 394 +22 Lines 14081 15244 +1163 Branches 3712 4124 +412 ========================================== + Hits 8146 8347 +201 - Misses 5871 6816 +945 - Partials 64 81 +17 ``` | [Flag](https://app.codecov.io/gh/opensearch-project/dashboards-observability/pull/2073/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | Coverage Δ | | |---|---|---| | [dashboards-observability](https://app.codecov.io/gh/opensearch-project/dashboards-observability/pull/2073/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | `54.75% <83.33%> (-3.10%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project#carryforward-flags-in-the-pull-request-comment) to find out more.

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