fix: improve dashboard fullscreen text

[xiezhongfu]

SUMMARY

Semantic name from toggle fullscreen to Enter fullscreen and Exit fullscreen.

BEFORE/AFTER ANIMATED GIF

before

after

TESTING INSTRUCTIONS

• Go to dashboard 3 dot menu, click Enter fullscreen
• After dashboard become fullscreen, click on 3 dot menu again
• Observe the last option Exit fullscreen to toggle back to normal screen

ADDITIONAL INFORMATION

issue: #15110

[zhaoyongjie]

except for CI. LGTM

[xiezhongfu]

except for CI. LGTM

I format the code. need a approval again.

[codecov]

Codecov Report

Merging #15139 (ddcf0b5) into master (856a2bd) will decrease coverage by 0.00%.
The diff coverage is 33.33%.

❗ Current head ddcf0b5 differs from pull request most recent head 2d1e973. Consider uploading reports for the commit 2d1e973 to get more accurate results

@@            Coverage Diff             @@
##           master   #15139      +/-   ##
==========================================
- Coverage   77.49%   77.49%   -0.01%     
==========================================
  Files         969      969              
  Lines       49902    49905       +3     
  Branches     6383     6386       +3     
==========================================
+ Hits        38671    38672       +1     
- Misses      11029    11030       +1     
- Partials      202      203       +1     

Flag	Coverage Δ
javascript	72.37% <33.33%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../components/Header/HeaderActionsDropdown/index.jsx	67.08% <33.33%> (-1.34%)	⬇️

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[zhaoyongjie]

LGTM